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All Labs670
Experiments in motion, light, matter, and the quantum world.
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670 experiments
Quantum & fields
Jet Clustering Microscope
Can one very soft particle change what we call a jet?
15 minQuantum & fields
Detector Response and Unfolding
Can two nearby peaks survive a blurred measurement?
25 minQuantum & fields
Collider Signals and Systematic Errors
When does a bump count as evidence for a new signal?
25 minQuantum & fields
Euclidean Field Correlations
How far do fluctuations of a free field remain correlated?
20 minQuantum & fields
Coarse Graining and Renormalization Flow
Why can a coarser field keep the same long-distance predictions?
25 minQuantum & fields
Finite-size Scaling
Can a beautiful data collapse give the wrong critical point?
20 minQuantum & fields
Decay Chain Counter
Why can daughter counts rise while the parent source is decaying?
15 minQuantum & fields
Proton Form Factors
How can scattered electrons separate a proton’s electric and magnetic responses?
15 minQuantum & fields
Nuclear Shell Filling
How does spin–orbit splitting open a shell gap at twenty-eight neutrons?
15 minFields & matter
Ising Critical Fluctuations
Why do large patches of aligned spins appear near a critical temperature?
12 minFields & matter
Hopfield Associative Memory
How can a network recover a whole picture from a damaged cue?
12 minFields & matter
Climate Energy Balance
Why does Earth keep warming after the heating stops increasing?
12 minFields & matter
Alfvén Waves
How can a magnetic field carry a sideways disturbance through a plasma?
12 minWaves & optics
CMB Spectrum Thermometer
How can a small foreground make a precise cosmic thermometer read too warm?
12 minWaves & optics
CMB Sky and Angular Power
Why does a broad telescope beam remove small sky patterns before large ones?
12 minWaves & optics
Supernova Distances and the Distance Ladder
How does a small distance zero-point error reach the whole universe?
25 minMotion & dynamics
Inside a Star in Hydrostatic Balance
What holds a star up against its own gravity?
15 minMotion & dynamics
Pulsar Timing and Orbital Decay
How can pulse arrival times reveal an orbit that slowly shrinks?
15 minFields & matter
Transistor Bias and Output Curves
Why does the collector current stop following the base current at low output voltage?
15 minFields & matter
Heterojunction Injection
How do a band step, bias and temperature change carrier injection?
15 minFields & matter
Blue LED: Recombination and Efficiency
Why can a blue LED become brighter while its efficiency falls?
15 minFields & matter
CCD: Follow the Charge
Why does a bright CCD pixel leave a trail when charge transfer is imperfect?
16 minFields & matter
GMR Spin Valve
How does rotating one magnetic layer change the resistance of a spin valve?
16 minQuantum & fields
SQUID: Flux into Voltage
How can a magnetic flux change a superconducting circuit’s voltage?
15 minQuantum & fields
Josephson Switching Statistics
Why does a biased Josephson junction switch before its critical current?
15 minQuantum & fields
Superconductors in a Magnetic Field
Why can a magnetic field enter one superconductor before it becomes normal?
15 minWaves & optics
Spontaneous Raman Spectrometer
Do molecular lines keep the same energy shift when the laser changes?
18 minWaves & optics
Optical Tweezers: Brownian Calibration
How does a bead’s thermal motion reveal the stiffness of an optical trap?
18 minWaves & optics
Attosecond RABBIT Metrology
How can electron spectra reveal the duration of an attosecond pulse train?
20 minFields & matter
Neutron Triple-Axis Spectrometer
What does a neutron’s final energy tell us about motion inside a sample?
20 minWaves & optics
Radio Echoes from the Ionosphere
Why does a radio echo suggest a higher layer than the height where the wave actually turns?
15 minMotion & dynamics
Transit Timing Variations and Planet Masses
What makes a planet cross its star late?
25 minWaves & optics
Eclipses and Transit Photometry
How much can a small dip in starlight tell us about a planet?
25 minMotion & dynamics
Debris Disk Sculpting
What can a bright dust ring tell us about an unseen planet?
25 minMotion & dynamics
Planet Migration, Disk Torques and Resonance
What makes a planet leave its birthplace?
30 minFields & matter
Turing patterns
Why can diffusion help a uniform mixture grow a pattern?
18 minFields & matter
Patterns on a growing domain
What happens to a chemical pattern when its domain expands?
18 minWaves & optics
Excitable waves and spirals
Why does a wave curl into a spiral, and why do two waves disappear when they meet?
18 minFields & matter
Contractile cortex and feedback
How can contraction gather more material, and what happens when one region stops pulling?
20 minFields & matter
Wheatstone & Kelvin Resistance Bridges
Why can zero detector current reveal an unknown resistance?
25 minFields & matter
LCR & Impedance Analyzer
Why can the same capacitor look resistive or inductive at another frequency?
20 minFields & matter
Digital Oscilloscope
When can a stable waveform be an illusion created by sampling?
15 minFields & matter
Lock-In Amplifier
How can a periodic signal smaller than the noise still be measured?
20 minFields & matter
FFT Spectrum Analyzer
Is a small spectral peak a real signal or leakage from a strong neighbour?
18 minFields & matter
Vector Network Analyzer
How can a network analyzer separate a device from its cables?
25 minMotion & dynamics
Resonance Tube & Sound Speed
Why is the loudest resonance shifted from the tube’s geometric length?
20 minMotion & dynamics
Inertial Seismometer
Does a seismometer record the ground, or the motion inside its case?
18 minFields & matter
Moving-Coil Meter and DC Multimeter
Why does connecting a meter change the quantity you want to measure?
20 minFields & matter
Active Particles Gather Without Attraction
How can particles gather when nothing pulls them together?
15 minFields & matter
Nematic Defect Microscope
How can a direction turn through half a circle around a defect?
15 minFields & matter
Active Nematic Flow
Why do differently shaped defects stir a fluid differently?
20 minFields & matter
Three-Sphere Swimmer: Why Back-and-Forth Strokes Fail
Why can a microswimmer not move by repeating one stroke forward and back?
15 minFields & matter
Swimmer Near a Wall: Glide, Turn In or Escape
Why does a microswimmer near a wall glide along it, turn into it or swim away?
15 minFields & matter
Two Swimmers: Stroke Timing Decides Attraction
Why do two identical microswimmers drift together in step but apart out of step?
15 minFields & matter
Phase-Space Filaments
Why does a ripple in a hot plasma fade with no collisions at all?
20 minFields & matter
Landau Damping and Trapping
When a plasma wave fades, which electrons take its energy?
20 minFields & matter
Plasma Wave Echo
Why does a plasma echo appear after two pulses have both faded?
25 minMotion & dynamics
Protoplanetary Dust Traps
How can drifting pebbles collect before they fall toward the star?
30 minMotion & dynamics
Planetary Atmospheric Escape
When does a warm atmosphere become an escaping wind?
25 minMotion & dynamics
U-Tube Manometer & Barometer
Do two liquid heights tell you an absolute pressure or a pressure difference?
15 minMotion & dynamics
Electrical Calorimeter
How can a warming curve reveal specific heat when the cup also warms and heat escapes?
15 minMotion & dynamics
Vernier Caliper & Micrometer
Why does a finer scale not automatically give a more accurate length?
15 minMotion & dynamics
Cavendish Gravitational Balance
How can a slowly twisting wire measure the attraction between two small spheres?
20 minMotion & dynamics
Comet Dust Tails and Radiation Pressure
Why does a comet's tail bend away from its path?
25 minMotion & dynamics
Planetary Ring Waves
How can a small moon leave a wave in a ring of moving particles?
25 minMotion & dynamics
Kozai–Lidov Cycles
How can a distant companion stretch a planet’s orbit?
25 minWaves & optics
Observing Cadence and Aliases
Why can the same variable star appear to have a different period when you change the observing times?
25 minWaves & optics
Galaxy Colors and Photometric Redshift
Is a red galaxy distant, old, or dusty?
25 minWaves & optics
Stellar Interferometry and Sparse Imaging
How can a few telescope pairs make an image of the sky?
25 minWaves & optics
Interstellar Radio Propagation
Why does one cosmic radio flash arrive at different times and with a rotated polarization?
25 minFields & matter
Electric Double-Layer Charging
Why does the current fade when ions cannot cross an electrode?
20 minFields & matter
Concentration Polarization and Space Charge
What changes when a membrane draws ions faster than diffusion can replace them?
25 minFields & matter
Induced-Charge Electro-osmosis
Why does reversing the field leave the flow unchanged?
18 minFields & matter
Electrochemical Impedance Inference
Can a perfect impedance fit identify the reaction pathway?
25 minFields & matter
Measuring a Flickering Membrane
Can a camera tell how hard a membrane is to bend?
25 minMotion & dynamics
Vesicle Shapes and Bending
How can the same membrane area enclose a long vesicle or a flattened one?
20 minMotion & dynamics
Pulling a Membrane Tether
Why does a long membrane tube resist pulling with nearly constant force?
15 minMotion & dynamics
Jarzynski Equality: Dragging a Trapped Bead
Can repeated irreversible pulls reveal the free-energy change of a reversible one?
20 minMotion & dynamics
Information Engine: Work From Measuring a Bead
How much work can a measurement of a trapped bead buy, and what limits it?
20 minMotion & dynamics
Hidden Entropy: How Much Dissipation Can You See?
How much of an enzyme’s dissipation can an observer prove from what it records?
20 minMotion & dynamics
Acoustic Radiation Force: Trapping Particles in a Standing Wave
How does a standing sound wave push particles into lines, and when does the stirred liquid win instead?
15 minMotion & dynamics
Ultrasound Pulse-Echo Imaging: Building a Picture from Echo Times
How does an ultrasound scanner turn echo arrival times into a picture, and what limits its sharpness?
15 minMotion & dynamics
Driven Bubble Oscillation: Linear Resonance and Nonlinear Radius
When does a gas bubble in a sound field stop behaving like a simple resonator?
15 minMotion & dynamics
Liquid Filament Necking
Why does surface tension turn a liquid thread into bulges and a thinning neck?
15 minMotion & dynamics
Coil–Stretch Transition: Polymers in Shear and Extension
Why does the same polymer solution barely change in shear yet stiffen enormously when stretched?
15 minMotion & dynamics
Capillary Thinning: Reading a Polymer Relaxation Time
Why does a drop of polymer solution pulled between two plates form a long thread instead of snapping like water?
15 minMotion & dynamics
Elastic Instability: Symmetry Breaking in a Four-Roll Mill
How can a slow polymer flow with no inertia at all lose its symmetry and start to oscillate?
20 minMotion & dynamics
Marangoni Surface Flow
Why does a warm spot push a thin liquid film aside?
16 minMotion & dynamics
Thin-Film Instability
Why does a nearly flat liquid film grow a pattern instead of smoothing out?
18 minQuantum & fields
MRI Frequency Encoding: Turning Position into Pitch
One coil hears every spin at once. How does a field gradient tell it where each one sits?
12 minQuantum & fields
MRI k-Space: Skip Lines, Fold the Head, Fill the Gaps
Each line of k-space costs one repetition. Which lines can you skip, and what does the image lose?
15 minQuantum & fields
MRI Diffusion Encoding: How Far Water Wanders
Two gradient pulses cancel for still water. How much signal do wandering molecules lose, and what changes when walls hem them in?
12 minFields & matter
Ballistic and Diffusive Heat in a Thin Film
Heat a film on one side. Does the heat diffuse across like ink, or fly straight to the far wall?
12 minFields & matter
Transient Thermal Grating: When Heat Rings Like Sound
Paint a striped temperature pattern with two laser pulses. Does it fade like diffusion, or swing hot and cold like a wave?
15 minFields & matter
Interface Thermal Resistance: The Temperature Jump at a Boundary
Join two solids and push heat across. Why does the temperature jump at the boundary, and when does that jump dominate?
12 minMotion & dynamics
Conical Pendulum
Why does a wider cone complete a turn sooner?
10 minMotion & dynamics
Centrifugal Governor
Why does the sleeve rise as the spindle speeds up?
10 minMotion & dynamics
Pantograph Drawing Copier
How can four bars copy a drawing at a different size?
12 minMotion & dynamics
Scissor Lift & Virtual Work
Why is a scissor lift hardest to raise near the ground?
12 minMotion & dynamics
Tusi Couple & Inner Rolling Tracer
Can two circles draw an exact straight line?
12 minMotion & dynamics
Outer Rolling Tracer
Why does the pen stop at a cusp while its center moves?
12 minMotion & dynamics
Cam Motion Designer
Can a follower stop while the cam keeps turning?
12 minMotion & dynamics
Crank-Shaper Quick Return
Why does a steady motor give the ram a fast return?
12 minMotion & dynamics
Peaucellier Inversor
How can hinged bars draw a straight line without a guide?
12 minMotion & dynamics
Trammel of Archimedes
On a trammel of Archimedes, where should the pen sit to draw a circle?
12 minMotion & dynamics
Universal Joint
Why does a universal joint set at an angle make the output speed up and slow down twice each turn?
15 minMotion & dynamics
Oldham Coupling
Can two offset shafts turn at exactly the same speed while the middle disc slides?
15 minMotion & dynamics
Geneva Drive
How can a turning input make the output wait?
15 minMotion & dynamics
Scotch Yoke
How does a slot turn a circle into a sine wave?
15 minMotion & dynamics
Four-Bar Linkage
Which link lengths let a four-bar linkage's input crank turn all the way around?
20 minMotion & dynamics
Slider-Crank Workshop
Why does a crank turning at steady speed move the slider unevenly?
20 minMotion & dynamics
Cart-Pole Balance
Can a cart's motor catch a falling pole and then bring the cart back to its start?
20 minMotion & dynamics
Reaction-Wheel Balance
How can spinning up a wheel keep a rod upright?
20 minMotion & dynamics
Rolling Wheel & Geometric Phase
If a wheel's heading and roll angle both return to their start, is the wheel back where it began?
20 minMotion & dynamics
Chaplygin Sleigh
Can a sleigh on a knife edge slow its turning without losing any energy?
20 minMotion & dynamics
Drum Modes & Strike Position
Why does striking a drum in a different spot change its vibration but not its frequencies?
20 minMotion & dynamics
Chladni Plate Resonance
Does driving a plate at one of its resonant frequencies always make that pattern vibrate?
20 minMotion & dynamics
Tidal Field Explorer
Why do tides stretch both the near side and the far side?
15 minMotion & dynamics
Tidal Heating and Locking
How can repeated deformation warm an icy world?
25 minMotion & dynamics
Gear Train & Idler
Does an extra gear change speed or direction?
15 minMotion & dynamics
Planetary Gears & Two Inputs
In a planetary gear set, why does holding a different part change how the others turn?
20 minMotion & dynamics
Swinging Spring & Internal Resonance
Can a bounce lend its energy to a swing?
20 minFields & matter
Solar Neutrino Flavor Observatory
How can you tell a fainter Sun from neutrinos that change flavor on the way?
25 minFields & matter
Long-Baseline CP Observatory
Can the neutrino and antineutrino spectra from an accelerator beam reveal the CP phase?
30 minFields & matter
Neutrino Sky Search Observatory
Does a neutrino hotspot found by scanning the whole sky count as real evidence?
25 minFields & matter
Beta Energy Sharing Observatory
Why do electrons from beta decay come out with a whole range of energies?
25 minFields & matter
Double Beta Decay Observatory
In double beta decay, what would a peak in the two electrons’ total energy mean, and what if none appears?
25 minFields & matter
Beta Endpoint Mass Observatory
How can electron energies near the end of the beta-decay spectrum reveal the neutrino’s mass?
25 minFields & matter
Reactor Near–Far Spectra
How can detectors near and far from a reactor reveal neutrinos disappearing on the way?
25 minFields & matter
Neutrino Matter Resonance
When a neutrino passes through matter of changing density, does its quantum state keep up with the change?
25 minFields & matter
Supernova Neutrino Burst Observatory
When should a sudden jump in neutrino events trigger a supernova alarm?
25 minFields & matter
Liquid Argon Time Projection Chamber
How does a liquid argon detector use timing to get a track’s third dimension?
25 minFields & matter
Atmospheric Neutrino Zenith Experiment
How can the direction atmospheric neutrinos come from reveal that some change flavor?
25 minFields & matter
Neutrino Flavor Propagation
Why does the chance of finding a neutrino in each flavor rise and fall as it travels?
25 minFields & matter
Reactor Antineutrino Coincidence
Can you widen the timing window to catch more reactor antineutrinos without letting in too many false pairs?
20 minFields & matter
Cherenkov Light & Detector Rings
When does a cone of light become a ring?
20 minFields & matter
IceCube: From Sensor Hits to a Track
Can the light recorded by IceCube’s sensors reveal which way a particle was going?
20 minWaves & optics
Single-Pass Optical Amplifier
Why does an inverted medium stop giving exponential gain?
20 minWaves & optics
Passive Optical Resonator
How can two mirrors with no gain between them pick out frequencies and store light?
20 minWaves & optics
Gain Curve Meets Longitudinal Modes
Which cavity modes survive after they saturate the gain?
25 minWaves & optics
Stable Resonator Geometry
Does a stable cavity guarantee that its beam fits through the aperture?
25 minWaves & optics
Alignment & Mode Matching
Why can a centered beam still reflect from a resonant cavity?
25 minWaves & optics
Mode Locking
Can a laser reach a much higher peak power without any more energy?
25 minWaves & optics
Laser Startup from Noise
How does a laser grow from random noise into one dominant mode?
25 minWaves & optics
Absorption, Spontaneous & Stimulated Emission
What decides whether atoms absorb resonant light or amplify it?
20 minWaves & optics
Pumping & Population Inversion
Why can't pumping a two-level system produce population inversion, when three- and four-level schemes can?
20 minWaves & optics
Stable Resonator & Transverse Modes
How should two mirrors be curved and spaced to make a stable cavity that favors the fundamental mode?
25 minWaves & optics
Negative Refraction & Superlens
How does a negative-index slab bend light the wrong way and recover fine detail that normally fades out?
25 minWaves & optics
Topological Photonic Edge State
Why does light on a topological ring lattice flow around a defect instead of bouncing back?
25 minWaves & optics
Nonlinear Light Shapes Its Own Medium
When can a bright beam raise the refractive index enough to guide itself and stop spreading?
20 minWaves & optics
Branched Light in Random Media
Why does light crossing gently uneven material gather into branches instead of spreading evenly?
15 minWaves & optics
Mirage & Green-Flash Observatory
How can layers of warm and cool air make distant objects sink, rise or appear several times?
15 minWaves & optics
Gradient-Index Optics Observatory
How can a smoothly varying refractive index guide and focus light with no surfaces inside it?
15 minWaves & optics
Unilluminable Room
Can a room with mirrored walls have a spot that a single small lamp inside never lights?
15 minWaves & optics
Ray Cloaking Challenge
Can a set of lenses steer light around an object and leave the background looking unchanged?
15 minWaves & optics
Gravitational Lens Telescope
How can light bent around an unseen mass reveal how heavy it is?
15 minWaves & optics
Thin Lens Imaging Bench
Where does a lens form the image of an object, and when can a screen catch it?
10 minWaves & optics
Thick Lens Designer
Where inside a thick lens does the light seem to bend, and how do you find that place?
12 minWaves & optics
Compound Optics Workbench
How does one matrix tell what two lenses do to a laser beam?
12 minWaves & optics
Parfocal Zoom Challenge
Can moving lens groups change the focal length while the image stays on the film?
15 minWaves & optics
Solar Concentrator & Étendue
Why can’t any lens or mirror concentrate sunlight onto an arbitrarily small spot?
15 minWaves & optics
Illumination & Radiometry Studio
How do you light a flat surface evenly when light fades with distance and angle?
12 minWaves & optics
Semiconductor Laser Diode
When does injected current become coherent output?
25 minWaves & optics
Ti:Sapphire Ultrafast Oscillator
What keeps an ultrashort pulse alive after every round trip?
25 minWaves & optics
Raman & Brillouin Lasers
Can transparent glass become a laser gain medium?
25 minWaves & optics
Random Laser
Can scattering hold light long enough to lase?
25 minWaves & optics
Thermal Lensing & High-Power Scaling
Can better cooling alone fix the beam of a high-power laser?
25 minWaves & optics
External Feedback & Laser Chaos
When does a delayed reflection destabilize a laser?
25 minWaves & optics
Tunable Laser & Mode-Hop-Free Scan
Why does rotating a grating alone cause mode hops?
25 minWaves & optics
Coherent Beam Combining
In coherent beam combining, does locking the phases fix every error?
25 minWaves & optics
Microresonator Kerr Comb
When can a laser-driven microring keep a short pulse circling inside it?
25 minWaves & optics
Pound–Drever–Hall Frequency Lock
Can reflection tell a laser which way to tune?
25 minWaves & optics
Laser Linewidth & Phase Noise
How does phase noise become a laser linewidth?
25 minWaves & optics
Injection Locking
How can a weak master laser make a stronger slave laser follow its frequency?
25 minWaves & optics
Regenerative & Multipass Amplifier
When should a pulse circulating in a regenerative amplifier be let out?
25 minWaves & optics
Nonlinear Frequency Conversion
Does a longer crystal always make more new light?
25 minWaves & optics
Chirped Pulse Amplification
Can a short pulse be amplified without its peak power getting dangerously high?
25 minWaves & optics
Fiber Laser & FBG Cavity
Does more fiber always give more useful output?
25 minWaves & optics
DFB, DBR & VCSEL Architectures
Where should feedback sit to select a laser mode?
25 minWaves & optics
Laser Medium Zoo
How do different laser media reach population inversion?
25 minWaves & optics
Optical Frequency Comb
What must you measure before a frequency comb can work as a ruler for light?
25 minWaves & optics
Laser Dynamics & Relaxation Oscillation
Why does a laser overshoot before it settles?
25 minWaves & optics
Q-Switched Giant Pulse
How can stored inversion become a giant pulse?
25 minWaves & optics
Output Coupler Optimization
Which output mirror gives a laser the most output power?
25 minWaves & optics
Gaussian Beam & Beam Quality
Can a lens make a poor beam diffraction limited?
25 minWaves & optics
Transverse Laser Modes
Which beam pattern wins when a laser's transverse modes compete for gain?
25 minWaves & optics
Build & Debug Your First Laser
When a laser you built won't lase, how do you find the fault?
25 minWaves & optics
Laser Diagnostic Bench
Which measurements tell laser light apart from fluorescence and amplified spontaneous emission?
25 minWaves & optics
Laser Noise Startup Workbench
Where does the first photon in a laser cavity come from?
20 minWaves & optics
Population Inversion Workbench
Why can stronger pumping still fail to produce gain?
15 minWaves & optics
Three Light–Matter Transitions
Does stimulated emission always mean amplification?
15 minWaves & optics
Laser vs Lamp vs LED
Can a very bright light still make interference fringes with poor contrast?
15 minFields & matter
Electron–Matter Signal Map
When an electron beam enters a specimen, where do the different signals come from?
20 minFields & matter
Raster Scan & Drift Recovery
Can aligning repeated frames undo the distortion that drift causes in a scanned image?
20 minFields & matter
Electron Diffraction & Reciprocal Space
Which reciprocal-lattice points become detector spots?
20 minFields & matter
Spin ARPES: Polarization & Counting
When reversing a spin detector's magnetization changes the count, is that spin or unequal photon flux?
25 minFields & matter
SEM Microanalysis: EDS & WDS
Do X-ray counts at the vanadium energy prove that a sample contains vanadium?
25 minFields & matter
FIB Lamella: From Bulk to TEM Grid
How do you lift out a thin specimen without losing its support or useful material?
20 minFields & matter
Electron Lithography: Draw, Expose, Develop
Why do isolated and dense lines develop differently?
20 minFields & matter
CBED: Thickness and Crystal Symmetry
What can the intensity inside CBED discs reveal about a crystal?
25 minFields & matter
MicroED: Rotate, Integrate, Fit the Basis
If the crystal turns through only a limited angle, along which directions can its diffraction locate the atoms?
25 minFields & matter
Aberration Corrector: Tune the Electron Probe
Can a wider cone of electrons focus to a sharper probe?
25 minFields & matter
Electron Ptychography: Recover Phase from Overlap
What do overlapping probe positions add to a set of diffraction patterns?
25 minFields & matter
Multi-beam SEM: Calibrate Before Stitching
Can a multi-beam SEM scan faster and still stitch its tiles into a seamless image?
25 minFields & matter
Ultrafast TEM: Resolve Time Without Losing Counts
Can many weak electron pulses capture fast dynamics that one intense pulse would blur?
25 minFields & matter
Single-particle Cryo-EM: From Movies to a Map
Can more particle images fill in a missing viewing direction?
30 minFields & matter
Photoelectron Structure: Direction and Depth
What can photoelectron diffraction and standing-wave scans tell you about where atoms sit?
30 minFields & matter
Electron Tomography: Reconstruct the Missing View
How much of a specimen's three-dimensional structure can a tilt series recover?
25 minFields & matter
Cryo Electron Tomography: Spend Dose, Average Copies
Can averaging many copies of a structure pull its signal out of the noise in a cryo-electron tomogram?
25 minFields & matter
Environmental SEM: Keep Water, Control Charge
Can chamber gas stop a wet insulator from drying out and charging without blurring the probe?
20 minFields & matter
Cryo-SEM: Preserve Before You Observe
Can you distinguish freezing damage, frost, charging and beam damage?
20 minFields & matter
STEM-in-SEM: Through a Thin Specimen
How thin must a specimen be for a useful SEM transmission image?
20 minFields & matter
STEM Detectors: Phase and Column Contrast
Why can changing the collection angles make the same atomic column bright or dark?
20 minFields & matter
EBSD: From Bands to Grains
Can you trust an EBSD grain map made with a bad calibration?
25 minFields & matter
TKD: Through the Nanocrystal
Can a thinner specimen resolve smaller grains?
25 minFields & matter
BSE: Composition or Orientation?
Can brighter grains prove a different composition?
20 minFields & matter
Low-energy SEM: Slow at the Surface
Can electrons travel fast in the column and land gently?
20 minFields & matter
Auger Spectra: What Sputtering Leaves Behind
Does removing one nanometre leave a one-nanometre-thinner film?
25 minFields & matter
Inverse Photoemission: Empty States
What can emitted photons tell us about empty electron states?
25 minFields & matter
FIB-SEM: From Slices to Volume
When can clear slices produce a wrong volume?
25 minFields & matter
Block-face SEM: Between the Cuts
Can sharp block-face images still miss structures that lie between two cuts?
25 minFields & matter
In-situ TEM: Stimulus or Beam?
In an in-situ TEM experiment, is the beam observing the response or helping drive it?
25 minFields & matter
Environmental-cell TEM: Bubbles and Pressure
How do pressure and beam-driven bubbles change an environmental TEM image?
25 minFields & matter
Lorentz TEM: Where the Walls Appear
Why does a magnetic domain wall switch from bright to dark when the defocus is reversed?
25 minFields & matter
Electron Holography: Recover the Hidden Phase
Can electron holography separate the magnetic part of the phase from the electric part?
25 minFields & matter
Dynamical Diffraction: When Intensity Returns
Does a thicker crystal always send more intensity into diffraction?
25 minFields & matter
Precession Diffraction: From Spots to Grains
Can swinging the electron beam around a cone make grain orientations easier to identify?
25 minFields & matter
Cathodoluminescence: Where Light Is Born
Does a dark spot mean the beam generated fewer carriers?
25 minFields & matter
Vibrational EELS: Resolution & Aloof Probes
How far can you narrow the electron source's energy band to sharpen a vibrational spectrum?
25 minFields & matter
STEM-EDS: Nanochemical Maps
Does a sharper electron probe guarantee a sharper chemical map?
25 minFields & matter
PEEM: Thresholds & Magnetic Domains
Can PEEM tell magnetic contrast apart from brightness caused by uneven illumination?
25 minFields & matter
LEEM: Measure Island Growth
Can a changing LEEM image tell you a surface island is growing?
25 minFields & matter
Micro / Nano ARPES: Spots & Domains
Can a smaller light spot resolve a narrow domain without damaging it?
25 minFields & matter
Momentum Microscopy: Time-of-Flight Cube
When does time-of-flight counting distort the band map in a momentum microscope?
25 minFields & matter
Time ARPES: Pulses & Relaxation
Does a decay measured in time-resolved ARPES show the true lifetime or the length of the pulses?
25 minFields & matter
AP-XPS: Through a Liquid Film
Can you recover the solid signal beneath a liquid film?
25 minFields & matter
HAXPES: Depth & Buried Interfaces
Can higher-energy X-rays reveal a layer buried under the surface?
25 minFields & matter
XPS: Elements, Chemical States & Charging
How can you tell whether a shifted XPS peak comes from a chemical change or from charging?
25 minFields & matter
UPS: Valence Bands & Work Function
Which two edges of a UPS spectrum give the work function?
25 minFields & matter
4D-STEM: One Scan, Many Virtual Images
What can you learn by recording a full diffraction pattern at every probe position?
25 minFields & matter
DPC: Beam Deflection & Projected Fields
When does the shift of the diffraction disk measure the field in the specimen?
25 minFields & matter
EELS: Energy Loss & Thin-Specimen Signals
What do electrons lose when they pass through a thin specimen?
20 minFields & matter
EFTEM: Energy Windows & Elemental Maps
Does a bright energy-filtered pixel mean more carbon?
25 minFields & matter
HRTEM Phase Contrast & CTF
Can the same atoms look dark in one high-resolution TEM image and bright in another?
20 minFields & matter
TEM Bright Field, Dark Field & SAED
In a TEM, which aperture selects one beam and which selects one region of the specimen?
20 minFields & matter
SEM Secondary-Electron Topography
Does a brighter surface mean a taller surface?
20 minFields & matter
TEM Mass–Thickness Contrast
Why does a denser inclusion look dark in bright-field TEM?
20 minFields & matter
Photoemission & Hemispherical Analyzer
Can you resolve two close peaks in a photoelectron spectrum without losing most of the counts?
20 minFields & matter
ARPES Band & Fermi-Surface Mapping
How does an emission angle reveal an electronic band?
20 minFields & matter
Electron Scattering & Mean Free Paths
How thin must a specimen be to avoid multiple scattering?
20 minFields & matter
Vacuum, Charging & Conductive Coatings
Can you stop charging without hiding the surface?
20 minFields & matter
Electron Dose, Noise & Damage
When does more exposure stop revealing more detail?
20 minFields & matter
Electron Wavelength & Voltage
Is higher accelerating voltage always better?
18 minFields & matter
Electron Gun Workbench
Which electron source gives the most coherent beam?
18 minFields & matter
Electron Optical Column
Can you focus an electron probe to a small spot and still keep enough current?
18 minFields & matter
Electron Resolution & Aberration Budget
Once spherical aberration is corrected, what limits how small the probe can be?
18 minMotion & dynamics
Tuned-Mass Damper Design
Can a small tuned mass keep a structure from shaking hard at resonance?
28 minMotion & dynamics
Parametric Resonance Playground
Can changing stiffness add energy without an applied drive force?
28 minMotion & dynamics
Satellite Attitude & Gravity Gradient
What can a long boom and a momentum wheel each do to keep a satellite pointed?
30 minMotion & dynamics
Tennis-Racket Theorem
Why does a free object spinning about its middle axis keep flipping over?
30 minMotion & dynamics
Gyroscope Precession Bench
Why does a spinning wheel precess instead of simply falling?
30 minMotion & dynamics
Spinning Top: Precession & Nutation
When does a nearly upright spinning top stay upright?
30 minMotion & dynamics
Coriolis Turntable
Why does a puck sliding freely on a turntable seem to curve when nothing pushes it sideways?
30 minMotion & dynamics
Foucault Pendulum & Earth Rotation
Why does a Foucault pendulum's length change its swing period but not how fast its swing plane turns?
30 minMotion & dynamics
Chaotic Billiards Arena
Can geometry alone create chaos?
35 minMotion & dynamics
Kicked Rotor & KAM Transition
Does keeping phase-space area fixed protect a kicked rotor from chaos?
35 minMotion & dynamics
Principle of Stationary Action
Must the physical path have the smallest action?
30 minMotion & dynamics
Hamiltonian Phase Space & Integrators
When a computer simulates an orbit, can a small energy error hide a wrong trajectory?
30 minMotion & dynamics
Radial Velocities, Active Stars and Binary Masses
Does a repeating Doppler shift prove that a planet is there?
30 minMotion & dynamics
Gravity-Assist Mission Designer
How can a flyby change speed without an engine burn?
30 minMotion & dynamics
Hohmann Transfer Planner
Can two burns change an orbit and meet a moving target?
30 minMotion & dynamics
Orbital Rendezvous in the Hill Frame
Does reaching the target also mean matching its velocity?
30 minMotion & dynamics
One-Dimensional Potential Landscape
Can you predict a particle's motion just from a graph of its potential energy?
25 minMotion & dynamics
Double-Well, Barrier & Separatrix Lab
How does a barrier between two wells change the way a particle moves?
30 minMotion & dynamics
Mechanical Lattice & Dispersion
How does a wave packet travel when its crests and its envelope move at different speeds?
30 minMotion & dynamics
FPUT Recurrence Laboratory
In a chain of masses and springs, can energy spread among the vibration modes and later return?
30 minMotion & dynamics
Granular Impact Chain Designer
For the same impact energy, can grading the bead masses in a chain lower the peak force on the wall?
30 minMotion & dynamics
Jamming Transition: Squeezing Soft Disks
At what packing fraction does a box of loose disks suddenly push back?
15 minMotion & dynamics
Soft Spots: Predicting Where a Sheared Packing Slips
Can the softest vibrations of a jammed packing point to the disks that slip next?
20 minMotion & dynamics
Shear Jamming: Frictional Grains That Lock Without Squeezing
Can shearing alone make loose frictional grains carry load?
15 minFields & matter
Near-Field Thermal Radiation: Probe Above Hot SiC
Why does a hot surface glow in almost one color when you probe within a micron of it?
15 minFields & matter
Near-Field Heat Transfer: Beating the Blackbody Limit
How can two plates exchange more heat than two black bodies?
15 minQuantum & fields
Casimir Force Oscillator: Hysteresis From the Vacuum
How can the Casimir force give a tiny oscillator a memory?
15 minMotion & dynamics
Atomic Stick-Slip: How an AFM Tip Feels Friction
Why does a tip dragged across a crystal move in jumps?
15 minMotion & dynamics
Thermal Friction: Why Faster Scans Rub Harder
Why does atomic friction grow as the scan gets faster?
15 minMotion & dynamics
Superlubric Flakes: How a Twist Cuts Atomic Friction
Why does a twisted flake glide while an aligned one sticks?
15 minMotion & dynamics
Duffing Oscillator Laboratory
Why can the same forcing frequency produce different responses?
28 minMotion & dynamics
Finite-Amplitude Pendulum
Does a bigger swing change a pendulum's period?
22 minMotion & dynamics
Bead on a Rotating Hoop
Where does a bead on a spinning hoop settle?
25 minMotion & dynamics
Driven Pendulum & Poincaré Section
Does a driven pendulum repeat itself if you check it once every drive cycle?
30 minMotion & dynamics
Inclined Plane & Friction
At zero speed, will the block stick or reverse?
22 minMotion & dynamics
Accelerating Wedge & Sliding Block
Can a frictionless normal force transfer energy?
22 minMotion & dynamics
Atwood Machine
In an Atwood machine, why are the rope tensions on the two sides unequal?
22 minMotion & dynamics
Pulley Network & Mechanical Advantage
When a pulley system lets you pull with less force, where does the saved force go?
22 minMotion & dynamics
Catenary & Suspension Cable
Is every hanging cable a parabola?
20 minMotion & dynamics
Center of Mass & Tipping
When an object could tip over any of several edges, which one goes first?
20 minMotion & dynamics
Lagrange Points & Three-Body Channels
If a probe has enough energy to cross from one body's region to the other's, will it actually cross?
25 minMotion & dynamics
N-Body Star Cluster
What happens after a cold cloud collapses?
25 minMotion & dynamics
Free-Body Diagram Builder
Which forces belong in an object's free-body diagram?
20 minMotion & dynamics
Stacked Blocks & Friction
When you push one of two stacked blocks, which contact slips first?
20 minMotion & dynamics
Spring Launcher
Will the ball actually leave the spring?
15 minMotion & dynamics
Bouncing Ball & Restitution
Where does the missing height go?
15 minMotion & dynamics
Pursuit & Interception
Where should you aim to catch a moving target?
12 minMotion & dynamics
Riverboat Navigation
Does the quickest crossing land straight opposite?
12 minMotion & dynamics
Galilean Frame Switcher
Which quantities of motion change when the observer changes?
25 minMotion & dynamics
Center-of-Momentum Frame Lab
Can total momentum vanish while both bodies keep moving?
25 minMotion & dynamics
Elevator Scale & Apparent Weight
When does a scale stop measuring your weight?
25 minMotion & dynamics
Terminal Fall & Drag Laws
Can two falling masses reveal the drag law?
25 minMotion & dynamics
Motion Graph Studio
Can one drawn curve determine the whole motion?
25 minMotion & dynamics
Motion Measurement & Numerical Differentiation
Do more frames always give better acceleration?
25 minMotion & dynamics
Work–Energy Graph Studio
Can the area under a force-position graph predict how an object moves?
25 minMotion & dynamics
Conservative Forces & Path Dependence
Does a force do the same work along any path between the same two points?
25 minMotion & dynamics
Curvature & Frenet Track Designer
How do the bends in a track and the speed along it set the normal acceleration?
25 minMotion & dynamics
Polar-Coordinate Kinematics
How do you find the velocity and acceleration of a point on an arm that stretches while it turns?
25 minMotion & dynamics
Crash Pulse & Impulse Engineering
If the same impulse stops an object, why does it matter when the force acts?
25 minMotion & dynamics
Braking Distance & Power Limits
How do reaction time, tyre grip and brake power each decide how far a car goes before it stops?
25 minMotion & dynamics
Gravity Field & Shell Theorem
Inside a hollow shell, where does the shell's gravity go?
25 minMotion & dynamics
Virial Theorem Observatory
When does the virial theorem actually hold?
25 minMotion & dynamics
Roller-Coaster Energy Designer
Can a roller-coaster car with enough energy to reach the top of a loop still leave the track?
25 minMotion & dynamics
Cycloid Challenge: Fastest & Isochronous
Which curve lets a bead slide down fastest and also makes beads from any height arrive together?
25 minMotion & dynamics
Column Buckling & Imperfection
Does a loaded column fail first by buckling or by its material yielding?
30 minMotion & dynamics
Stress–Strain Material Tester
What is left in a material after you load it and then take the load off?
30 minMotion & dynamics
Buoyancy & Metacentric Stability
Can a floating hull still overturn?
30 minMotion & dynamics
Shallow-Water Waves & Dam Break
Does a dam-break flood front move at the speed of small water waves?
30 minMotion & dynamics
Rotational Rheometer & Couette–Poiseuille Flow
Why can torque rise as a liquid becomes easier to shear?
20 minMotion & dynamics
Surface Tension & Capillary Laboratory
Can the height a liquid climbs in a thin tube tell surface tension apart from wetting?
25 minMotion & dynamics
Continuity & Bernoulli Flow Bench
Where does the pressure go when liquid flows through a narrow part of a pipe?
25 minMotion & dynamics
Siphon, Pressure Limit & Cavitation
How high can a primed siphon lift the liquid?
25 minMotion & dynamics
Hydrostatics & Hydraulic Press
Does a hydraulic press give out more work as well as more force?
20 minMotion & dynamics
Draining Tank & Torricelli Law
Can a draining tank's falling water level show how far the outflow falls short of the ideal?
20 minMotion & dynamics
Truss Bridge Force Explorer
What is the least material a truss bridge needs to carry a load anywhere on its deck?
25 minMotion & dynamics
Beam Bending Laboratory
Can measured bending reveal material stiffness?
25 minMotion & dynamics
Precision Balance and Air Buoyancy
Why can the same object give a different mass reading in air?
25 minMotion & dynamics
Capstan & Belt Friction
With a rope wrapped around a drum, how little force can hold a heavy load?
20 minMotion & dynamics
Angular-Momentum Skater
Can angular momentum stay fixed while kinetic energy increases?
22 minMotion & dynamics
Moment-of-Inertia Designer
Which distances matter to rotational inertia?
22 minMotion & dynamics
Rolling Race Laboratory
Does a solid sphere always win a race down a slope?
22 minMotion & dynamics
Yo-Yo & Spool Direction Puzzle
Does a spool always roll the way you pull its string?
22 minMotion & dynamics
One-Dimensional Collision Bench
What survives an inelastic collision?
20 minMotion & dynamics
Two-Dimensional Collision Table
What sets the scattering angle in a two-dimensional collision?
22 minMotion & dynamics
Ballistic Pendulum Lab
Can you work out a projectile's speed from how high the pendulum swings?
24 minFields & matter
How an Offset Circle Becomes a Lifting Airfoil
What sets how much circulation an airfoil carries, and so how much lift it makes?
12 minMotion & dynamics
Double Pendulum & Chaos
How long do two nearly identical releases of a double pendulum follow the same path?
8 minMotion & dynamics
How Orbits Take Shape
How can one force law draw three different conic sections?
10 minWaves & optics
When Two Waves Meet
Why do passing waves leave a stable fringe pattern?
6 minFields & matter
Make an Electric Field Visible
How can the shape of the electric potential tell you the force on a charge?
8 minWaves & optics
Draw Any Wave with Circles
How can steady rotations rebuild almost any periodic signal?
12 minFields & matter
Billions of Collisions in a Gas
How do random collisions settle into a steady pressure, temperature and speed distribution?
7 minMotion & dynamics
How Coupled Springs Move Together
Can one bead's swing grow and fade while the energy in every normal mode stays fixed?
10 minWaves & optics
Light after a Narrow Slit
Why does a narrower opening spread light farther?
8 minFields & matter
A Charge Bending through Fields
How can a magnetic field turn motion without changing speed?
10 minQuantum & fields
How Cooper Pairs Condense
How do loose Cooper pairs turn smoothly into tightly bound molecules that condense?
16 minMotion & dynamics
Binary Neutron Star Merger
What happens when two neutron stars spiral together and merge?
14 minMotion & dynamics
How a Black Hole Bends Light
Why can one thin accretion disk appear both above and below the black-hole shadow?
12 minMotion & dynamics
The Three-Body Dance
Why does one extra body remove the general orbit formula?
12 minWaves & optics
How a Lens Redirects Light
How do three principal rays locate and size an image?
7 minWaves & optics
Listen to Spacetime with Light
How can a length change smaller than a proton become a readable signal?
15 minFields & matter
Why a Spinning Ball Curves
How does tilting a ball's spin axis change the way it curves and where it lands?
8 minFields & matter
How One Moving Wall Drives an Entire Fluid
Why does a right-moving lid create one giant clockwise circulation inside a sealed cavity?
12 minFields & matter
How Neighbors Reconstruct a Splashing Pool
How can particles that only sense their neighbors work out the density and pressure of splashing water?
16 minFields & matter
How a Tiny Ripple Rolls into a Shear Vortex
When does a ripple between two fluid layers sliding past each other start to grow?
16 minFields & matter
Bend a Wall, Transform a Flow
Why does a conformal map change flow speeds near corners even though it preserves angles?
12 minFields & matter
Stretch the Dye, Keep the Rotation Ledger
How can a flow with no viscosity stir dye into fine threads without losing energy or rotation?
14 minFields & matter
Let Pressure Write the Shock Diamonds
Why does a supersonic jet form a chain of diamonds when its exit pressure differs from the surrounding air?
16 minFields & matter
Push a Numerical Jet by Hand
What do advection, diffusion and pressure projection each do in a fluid simulation?
12 minFields & matter
How Phase Turns Flapping into Propulsion
How does the timing between a wing's heaving and pitching decide whether it makes drag or thrust?
14 minFields & matter
Why a Symmetric Wake Breaks Itself
Why does the wake behind a fixed cylinder shed vortices from alternate sides?
12 minFields & matter
How Signed Singularities Assemble Fluid Orbits
How do a handful of point vortices move one another?
14 minMotion & dynamics
Mass–Spring Oscillator
What sets the period of a mass bouncing on a spring?
18 minMotion & dynamics
Damped Oscillations & Ringdown
When can the peaks of a filmed oscillation give you its damping and stiffness?
18 minMotion & dynamics
Driven Resonance & Phase Lag
Do a driven oscillator's largest swing and largest power intake happen at the same frequency?
18 minMotion & dynamics
Free Fall & Measuring Gravity
Can a noisy camera and a coarse photogate timer measure gravity accurately?
14 minMotion & dynamics
Projectile Flight Designer
How do you aim a launch to hit a target through drag and crosswind?
16 minFields & matter
How One Diaphragm Creates Three Compressible Waves
Why does bursting the diaphragm in a shock tube send out a shock, a contact surface and a rarefaction fan?
15 minWaves & optics
How One Opening Redraws a Water Wave
Why does narrowing an opening spread the transmitted wave through a wider angle?
9 minFields & matter
How a Thermal Gradient Organizes into Rolls
When does a fluid layer heated from below start to convect?
12 minFields & matter
Immune Design from Molecule to Organoid
How does a T cell recognizing an antigen lead to clearing targets across a whole tissue?
12 minFields & matter
From Hard Spheres to Boltzmann
How can the Boltzmann equation be derived rigorously from Newtonian collisions of hard spheres?
14 minWaves & optics
Two Refractions inside a Thick Lens
What does the thin-lens model miss when thickness matters?
12 minWaves & optics
A Rainbow Only Nanometres Thick
Why does a colorless film only hundreds of nanometres thick develop flowing color?
11 minFields & matter
Why Two Vortex Rings Leapfrog
Why does the rear vortex ring shrink and slip through the front one?
12 minFields & matter
How Rotating Shear Fractures into Taylor Cells
Why can fluid swirling between two cylinders break up into stacked rolls?
14 minFields & matter
WBE and the Quarter-Power Pace of Life
How can a branching supply network explain why metabolism and heart rate scale with body mass?
12 minWaves & optics
How a Laser Builds inside a Cavity
Which waves return between two mirrors and keep growing?
15 minFields & matter
How Stars Build Elements up to Iron
Why does fusion release energy only until nuclei approach iron?
15 minMotion & dynamics
Light Signals and Moving Clocks
Why does seeing a clock tick differ from dating it or reading the clock itself?
15 minMotion & dynamics
Twin Clocks and Radar Time
Which moment at home does a travelling twin call now, and why does the turnaround matter?
20 minMotion & dynamics
Collisions and Invariant Mass
Why does every frame agree on a collision's invariant mass when energy and momentum change?
20 minMotion & dynamics
Griffith Criterion for Crack Growth
When does a crack start to grow, and does it then stop or run away?
15 minMotion & dynamics
Phase-Field Fracture Model of a Growing Crack
Can a smooth damage field decide on its own where a crack goes?
20 minMotion & dynamics
Dynamic Crack Branching in a Stretched Strip
Why does a fast crack split or wander instead of running straight?
20 minFields & matter
Pulse Switching of a Nanomagnet
How can a field pulse shorter than a nanosecond flip a nanomagnet, and why does a longer pulse fail?
20 minFields & matter
Domain Wall Motion and Spin Waves
Why does a field push a domain wall only so fast, and how does interfacial DMI raise that limit?
25 minFields & matter
Skyrmion Motion in a Track
Why does a current push a skyrmion sideways, and when does a weak spot or an edge stop it?
25 minFields & matter
Genetic Drift and Fixation: Who Takes Over a Small Population?
How often does a new mutation take over a population of fifty, and how long does that take?
15 minFields & matter
Range Expansion Sectors: Why a Mixed Colony Grows in Stripes
Why does a colony started from well-mixed colours grow into a few single-colour sectors?
15 minFields & matter
Pulled and Pushed Waves: Where an Invading Population Comes From
Does a spreading population descend from the few pioneers at its tip, or from the crowd behind them?
15 minMotion & dynamics
Arch Snap-Through
Why does a buckled strip jump to its mirror shape, and what sets how fast it goes?
20 minMotion & dynamics
Non-Euclidean Plate
Why does a disc that grows into a curved geometry stay flat when thick but turn into a dome when thin?
25 minMotion & dynamics
Kresling Origami Cell
Why does a twisted origami tube click shut when pressed, and stay shut?
20 minMotion & dynamics
Seismic Wave Reflection and P-to-S Conversion at an Interface
What happens to a P wave when it hits a rock boundary at an angle?
15 minMotion & dynamics
Earthquake Location from Arrival Times and Its Error Ellipse
How do arrival times at a few stations pin down where an earthquake started, and how sure can you be?
15 minMotion & dynamics
Travel-Time Tomography: Ray Coverage, Resolution and Damping
How do many travel times become a map of fast and slow rock, and how far can you trust that map?
15 minMotion & dynamics
Full-Waveform Inversion with the Adjoint Method and Cycle Skipping
Why does waveform inversion need low frequencies or a good starting model?
20 minFields & matter
Edge Dislocation Glide: When Does Shear Tear a Dipole Apart?
How much shear does it take to pull apart two edge dislocations that attract each other?
15 minFields & matter
Grain Growth by Curvature: Why Small Grains Vanish
Why do grains with fewer than six sides shrink while grains with more grow?
15 minFields & matter
Alloy Dendrite Growth: Why Phase-Field Models Need Anti-Trapping
How does a dendrite grow into a supersaturated alloy melt, and why does a diffuse interface trap too much solute?
15 minFields & matter
Hodgkin–Huxley Model: How a Squid Axon Fires an Action Potential
What turns a small shock into an all-or-none spike, and what do the clamp currents reveal?
15 minFields & matter
Stochastic Ion Channels: Why Small Neurons Fire Unreliably
When a patch holds only a few thousand channels, does the same shock always fire a spike?
15 minFields & matter
Neural Avalanches and Criticality: When a Power Law Misleads
Does a power-law distribution of avalanche sizes show that a network is critical?
15 minWaves & optics
Optical Boundary Explorer
What happens to light's speed, direction and power when it crosses into a new material?
11 minWaves & optics
Hall of Mirrors
Which virtual images can an observer actually see as mirrors move?
11 minWaves & optics
Mirror Engineering Challenge
Can a few mirrors steer a beam to a fixed target just by getting the angles right?
13 minWaves & optics
Curved Mirror Observatory
How does mirror shape move the focus and change off-axis image quality?
13 minWaves & optics
Caustic Factory
Why does light reflected or refracted by a curved surface gather into sharp, bright curves?
15 minWaves & optics
Floating Image Mirascope
Where do two facing parabolic mirrors form the floating image you can see but not touch?
15 minWaves & optics
Fermat Path Finder
Why can one rule about travel time explain reflection, refraction and curved light rays?
13 minWaves & optics
Underwater Vision Observatory
How can one flat water surface make a fish look shallower, fool a spear, squeeze the sky and distort photos?
11 minWaves & optics
Window Ghost Observatory
Why does window glass barely shift the view through it, yet show ghost images at night?
11 minWaves & optics
N-BK7 Prism Spectrometer Observatory
How do you set up a glass prism so that where each color lands tells you its wavelength?
13 minWaves & optics
Rainbow Caustic Observatory
How can one water drop create primary and secondary bows with a dark band between them?
13 minWaves & optics
Camera Obscura
What size of pinhole gives the sharpest picture?
13 minWaves & optics
Photography Optics Playground
From one camera position, what do focal length and aperture change in a photo?
13 minWaves & optics
Lens Aberration Clinic
How do you identify a lens aberration from its blur and fix it without creating another?
17 minWaves & optics
Anamorphic & Cylindrical Optics
How can a lens stretch or squeeze an image in one direction only?
15 minWaves & optics
Human Eye & Corrective Optics
What lens corrects short sight, long sight, presbyopia or astigmatism?
13 minWaves & optics
Build a Microscope
What sets the smallest detail a microscope can resolve?
13 minWaves & optics
Build a Telescope
How do aperture, optical layout, and obstruction determine what a telescope can resolve?
13 minWaves & optics
Binocular Prism Lab
How do binocular prisms turn the image upright, and why can a roof prism blur it?
17 minWaves & optics
Telecentric Metrology Camera
Can a camera measure an object's size correctly when the image is out of focus?
15 minWaves & optics
Tilt-Shift & Scheimpflug Studio
How does tilting the lens rotate the plane of focus and reshape depth of field?
15 minWaves & optics
Pupils, Stops & Vignetting
What do the different openings inside a lens system each limit?
17 minWaves & optics
Projector Optics Lab
Why can a bigger light source fail to brighten a projector, and why does a tilted screen also blur?
17 minWaves & optics
Smartphone Camera Module
What do folding, autofocus and stabilization each do in a thin phone camera, and what can none of them fix?
17 minWaves & optics
VR Headset Optics
Why can a VR headset change depth while focus stays fixed, and why does a small eye shift cut off the corners?
15 minWaves & optics
Ghost Image, Pepper’s Ghost & HUD
Where does a half-mirror image appear, and why can a bright background or the mirror’s edge hide it?
13 minWaves & optics
Light-Field Camera & Display
Can one light-field photo be focused on either near or far objects, and what does that cost?
15 minWaves & optics
Coherent Wave Composer
Why do a phasor diagram, a wavefront picture and a detector reading all describe the same interference?
11 minWaves & optics
Young Double-Slit Bench
How do slit width, slit spacing, phase and coherence each change a double-slit pattern?
11 minWaves & optics
Thin-Film Color Studio
Why does a thin film reflect color, and why does the color shift when you tilt it?
13 minWaves & optics
Interference Surface Metrology
How can interference fringes map the shape of a surface, down to tiny defects?
13 minWaves & optics
Michelson Precision Lab
How can counting fringes measure displacement, wavelength, and refractive index?
13 minWaves & optics
LIGO Interferometer
How does a kilometer-long interferometer turn a passing gravitational wave into a measurable signal?
17 minWaves & optics
Mach–Zehnder Sensor
Can a Mach–Zehnder’s two outputs tell a refractive-index change from absorption or polarization marking?
17 minWaves & optics
Fabry–Pérot Passive Cavity
How can two highly reflective mirrors let all the light through, and what does loss do to the resonance?
17 minWaves & optics
Sagnac Gyroscope
How can two beams in the same fiber detect rotation, and why can’t brightness alone tell which way it turns?
17 minWaves & optics
Division-of-Wavefront Interferometers
Why is the fringe dark where Lloyd’s mirror meets the screen, but bright at a biprism’s center?
17 minWaves & optics
Low-Coherence Interferometry & OCT
How can broadband light reveal the depth a reflection came from inside a sample?
15 minWaves & optics
Speckle Lab
Why does coherent light scattered by a diffuser look grainy, and can averaging images smooth it out?
15 minWaves & optics
Holography Studio
How can a plate that records only brightness keep the phase needed to rebuild a three-dimensional wavefront?
17 minWaves & optics
Moiré & Fringe Metrology
How can broad fringe patterns reveal a tiny shift or the shape of a surface?
15 minWaves & optics
Huygens–Fresnel Propagation Lab
How does a diffraction pattern change from close to the aperture to far away?
13 minWaves & optics
Aperture Diffraction Studio
How is the diffraction from a hole related to that from an obstacle of the same shape?
13 minWaves & optics
Crystal Diffraction & Reciprocal Space
How can the spots and rings in a diffraction pattern reveal a crystal’s lattice?
17 minWaves & optics
Diffraction-Grating Spectrometer
What sets how finely a grating spectrometer can separate two close wavelengths?
13 minWaves & optics
Diffractive Lens Workshop
How does a diffractive lens focus light, and what do finer phase steps improve?
17 minWaves & optics
Talbot Carpet
Why does light behind a grating repeat the grating’s pattern at certain distances?
15 minWaves & optics
Optical Fourier Processor
How can a mask between two lenses keep only an image’s edges, blur it or erase a repeating pattern?
17 minWaves & optics
Abbe Resolution Lab
Why can tilting the light reveal stripes a microscope misses, and why can blocking some light fake finer ones?
13 minWaves & optics
PSF–OTF–MTF Imaging Lab
Can a lens swap the bright and dark parts of stripes, and can pixels invent a stripe period that isn’t there?
17 minWaves & optics
Phase Microscopy Lab
Can a transparent cell be seen without staining, and is the relief it seems to have real?
15 minWaves & optics
Schlieren Flow Viewer
How does a knife edge make invisible air flow visible, and why does turning it make some features vanish?
15 minWaves & optics
Pupil Engineering & Coronagraph
How can a telescope block a star’s light and still see a planet right next to it?
15 minWaves & optics
Phase Retrieval Challenge
Can you recover the phase of light from brightness measurements alone?
15 minWaves & optics
Coded-Aperture Camera
How can a camera with a patterned mask instead of a lens form an image?
15 minWaves & optics
Computational Deblurring Lab
When does deconvolution recover detail, and when does it only amplify noise or model error?
17 minWaves & optics
Adaptive Optics Observatory
How can measured wavefront slopes drive a mirror fast enough to sharpen a turbulent star image?
15 minWaves & optics
Ptychography & Coherent Diffraction Imaging
How can overlapping illumination recover both the amplitude and the phase of an object without a lens?
15 minWaves & optics
Polarization State Explorer
How can a Jones vector, an ellipse and Stokes measurements all describe the same polarization state?
13 minWaves & optics
Polarized Reflections & Sky
Why does a polarizing filter usually need different angles to darken water glare and blue sky?
13 minWaves & optics
Birefringent Crystal Lab
Why does a birefringent crystal split one ray into two side-by-side rays?
13 minWaves & optics
Waveplate & Poincaré Sphere Lab
How does a waveplate move a polarization state on the Poincaré sphere?
13 minWaves & optics
Optical Activity Polarimeter
What can a rotating analyzer really tell us about an unknown chiral solution?
13 minWaves & optics
Photoelastic Stress Viewer
How do colorful polarization fringes map the principal-stress difference inside a loaded object?
15 minWaves & optics
LCD Pixel Microscope
How can three voltage-controlled liquid-crystal shutters make one colored pixel?
17 minWaves & optics
TIR Phase & Fresnel Rhomb
How can total internal reflection, which returns all the light, act as a waveplate that works across many wavelengths?
15 minWaves & optics
Faraday Isolator
Why can a Faraday isolator pass light going forward but block the same light coming back?
17 minWaves & optics
Electro-Optic Modulator
How can a voltage across a crystal control the brightness of a light beam?
17 minWaves & optics
Optical Fiber: Rays to Modes
When does the picture of rays bouncing inside a fiber stop working, so that light must be treated as modes?
13 minWaves & optics
Fiber Pulse Propagation
How does dispersion reshape an ultrashort pulse as it travels along a fiber?
17 minWaves & optics
Evanescent Directional Coupler
How can light cross from one waveguide into a nearby one that it never touches?
15 minWaves & optics
Microring & Whispering-Gallery Resonator
Why does a small ring beside a waveguide make the transmitted light dip at certain wavelengths?
15 minWaves & optics
Photonic Crystal Band Structure
How can a periodic dielectric block some frequencies of light, yet trap or guide light at defects?
15 minWaves & optics
Boundary Wave Tunnel
How can light still get through a narrow gap when it should be totally internally reflected?
15 minWaves & optics
Beam Shift Microscope
Why does a reflected light beam shift slightly, both within and out of the plane of incidence?
15 minWaves & optics
Gaussian Beam & Gouy Phase
How do the width and phase of a focused Gaussian beam change as it passes through the focus?
17 minWaves & optics
Self-Healing Beam Arena
How do Bessel and Airy beams rebuild themselves after part of them is blocked?
15 minWaves & optics
Light in Disorder
How can interference in disordered material send extra light straight back, or stop light from spreading sideways?
15 minWaves & optics
Optical Vortex & OAM
Can a bright petal pattern carry zero average orbital angular momentum?
15 minWaves & optics
Vector Beams & Optical Skyrmions
What makes the polarization pattern across a beam an optical skyrmion?
15 minWaves & optics
Photonic Nanojet & Hook
How can a tiny transparent particle squeeze light into a very narrow jet, or bend it into a hook?
15 minWaves & optics
Superoscillation Designer
How can band-limited waves add up to a hotspot smaller than the diffraction limit?
15 minWaves & optics
Surface Plasmon Resonance Lab
How does surface plasmon resonance detect a change in a sample's refractive index?
15 minQuantum & fields
Light Signals in Global AdS
How can light reach the AdS boundary in finite global time?
15 minQuantum & fields
AdS Interval Entanglement
How can the size of a boundary region select a curve inside AdS?
18 minQuantum & fields
Boundary Quantum Error Correction
How much of an encoded quantum state can be erased and still recovered?
20 minWaves & optics
Stellar Parallax and Proper Motion
Can two stars beside each other on the sky be far apart in space?
18 minWaves & optics
Crowded-star Photometry
Can a neighboring star make a steady star look brighter?
15 minWaves & optics
Stellar Absorption Lines
Why does the same spectral line deepen, broaden or move?
20 minWaves & optics
Stretch a Single DNA Molecule
How much of a pull stretches DNA, and how much moves the bead?
20 minFields & matter
Stochastic Unfolding Force Spectroscopy
Why does the same molecule unfold at different forces?
20 minFields & matter
ATP Molecular Motor
How does ATP drive a molecular motor against a load?
20 minFields & matter
Free Energy Hides a Dimension
Why does a low potential-energy route sometimes look unlikely in a free-energy profile?
18 minFields & matter
Umbrella Sampling and MBAR
When do overlapping biased trajectories reveal the equilibrium free energy?
25 minFields & matter
Same Free Energy, Different Clock
Can two systems have the same free energy and different reaction times?
25 minQuantum & fields
Build a Self-Consistent Hydrogen Molecule
How can an electron density agree with the field it creates?
20 minQuantum & fields
Why Hartree–Fock Struggles to Break a Bond
Why can a good description near equilibrium fail as a bond stretches?
25 minQuantum & fields
Map Electronic-Structure Errors Along a Bond
Does a small energy error also guarantee a good bond force?
25 minQuantum & fields
Optomechanical Sideband Cooling
How can light cool a vibrating mirror?
16 minQuantum & fields
Continuous Optomechanical Measurement
Why does brighter light reveal a mirror’s motion and shake it more?
25 minQuantum & fields
Optomechanical Photon Blockade
Can one photon move a mirror enough to keep a second photon out?
18 minQuantum & fields
Bjorken Expansion
Why does a plasma cool differently when it can push along its expansion?
18 minQuantum & fields
Hydrodynamic Attractor
Can expanding matter forget its starting pressure before the pressures become equal?
18 minQuantum & fields
Three Ways Through an Avoided Crossing
Do quantum waves, a mean force and hopping trajectories predict the same reaction branches?
18 minQuantum & fields
Benchmark Nonadiabatic Reaction Methods
Can more trajectories remove an approximation’s error in a reaction probability?
25 minQuantum & fields
Geometric Phase Around a Conical Intersection
Why can a circuit around a conical intersection turn a bright fringe dark?
14 minQuantum & fields
From Eccentricity to Collective Flow
Why do more particles leave along the short axis?
15 minQuantum & fields
QGP Transport Inference
How much does a viscosity estimate depend on the initial state?
25 minQuantum & fields
Gluon Scattering Amplitudes
Why can changing a polarization reference move every diagram and leave their sum fixed?
25 minQuantum & fields
S-matrix Bootstrap
How much does consistency tell us about a scattering amplitude?
20 minQuantum & fields
Joint Spectral Phase & Photon Purity
Can identical joint intensities hide different photon purities?
15 minQuantum & fields
Quantum Pulse Gate
Can choosing how to detect one photon purify its partner?
20 minQuantum & fields
Photon Echo Pulse Sequence
How can three light pulses make a dephased ensemble emit an echo?
18 minWaves & optics
Coupled Vibrations in Two-Dimensional IR
How does coupling between two vibrations appear in a two-dimensional infrared spectrum?
25 minWaves & optics
Spectral Diffusion and Frequency Memory
How long does a molecule remember its vibration frequency?
25 minWaves & optics
One Sky and Cosmic Variance
Why does a perfect map still leave uncertainty about the Universe?
20 minWaves & optics
CMB Acoustic Peaks
How can different expanding universes leave almost the same acoustic pattern?
20 minWaves & optics
Cosmology, Likelihoods and Priors
How can the same sky data support a stable estimate and a changing model preference?
22 minQuantum & fields
Gauss Law on a Lattice
Can every charge and electric link be chosen independently?
15 minQuantum & fields
Electric Strings and Screening
How can a dynamical particle pair weaken an electric string?
25 minQuantum & fields
Protecting the Gauge Subspace
Does a large Gauss penalty keep an imperfect simulator physical?
25 minQuantum & fields
Matrix Product State Compression
How few numbers does a quantum spin chain really need?
15 minQuantum & fields
TEBD Quench and the Trusted Time Window
How long can a matrix product state follow a quantum quench?
20 minQuantum & fields
DMRG Ground State Sweeps
How does DMRG find a ground state, and how do you know it has?
20 minQuantum & fields
Two-Photon Waveguide Scattering
What changes when a second photon reaches an atom before the first has left?
20 minQuantum & fields
Structured Bath and Output Ports
How does the surrounding waveguide change the photon that reaches a port?
18 minQuantum & fields
Quantum Node Photon Collection
Can a collected photon still miss the receiving mode?
18 minQuantum & fields
Nuclear Spectra and Collective Motion
Can nuclear level spacings tell rotation from a single-neutron excitation?
18 minQuantum & fields
Nuclear Optical Potential
Can one scattering pattern determine a nuclear potential?
20 minQuantum & fields
Stellar Reaction Rates
Which collision energies set a star’s nuclear reaction rate?
20 minQuantum & fields
Local Phase & Wilson Loops
Which phase changes alter an interference experiment?
15 minQuantum & fields
Heavy Mediator & Effective Field Theory
When can a heavy particle be replaced by a few low-energy interactions?
20 minQuantum & fields
Operator Bases & False Constraints
Can changing an operator basis make a physical prediction more precise?
20 minQuantum & fields
Anomalies & Lattice Spectral Flow
What happens to the extra fermion at the edge of a lattice spectrum?
25 minQuantum & fields
Weak Decay and the Mirror Test
Why does reversing the nuclear spin reverse the preferred electron direction?
15 minQuantum & fields
Neutral Kaons in Flight
How can a neutral kaon change flavour while its probability of survival falls?
20 minQuantum & fields
Inside the Proton
What do a scattered electron’s energy and direction reveal about the proton?
20 minQuantum & fields
Quantum Phase Estimation
In quantum phase estimation, how much more evolution does each extra bit of precision need?
25 minQuantum & fields
Grover Amplitude Amplification
Can one extra round make the answer harder to find?
25 minQuantum & fields
Resonant Tunneling Transport
Can two barriers transmit better than one?
20 minQuantum & fields
Gravitational Quantum Bouncer
How tall must a slit be for a neutron to get through?
20 minQuantum & fields
Thouless Transport Pump
How can slowly cycling a chain's parameters back to their start still move particles across it?
20 minQuantum & fields
Spin Squeezing Metrology
Does squeezing the noise of a spin ensemble always give a more precise measurement?
20 minQuantum & fields
Quantum Spin Chain Quench
If you flip one spin in a chain, where does its influence go?
20 minQuantum & fields
Quantum State & Process Tomography
Can measuring along one direction reveal a whole quantum state?
20 minQuantum & fields
Quantum Error Correction
Can you find an error without reading the encoded message?
20 minQuantum & fields
Identical Atom Exchange
When two atoms in neighboring traps tunnel at the same time, do they end up together or apart?
18 minQuantum & fields
Quantum Gas Occupation
When the same trap is cooled, which particles crowd into the lowest energy level?
18 minQuantum & fields
Hydrogen Orbitals & Spectra
Why can a hydrogen spectral line be missing even when the energy gap matches?
20 minQuantum & fields
Partial-Wave Scattering
Why does scattering off a single round target show so many minima?
20 minQuantum & fields
Franck–Hertz Excitation
Why can a higher voltage make the current drop?
20 minQuantum & fields
Laser Cooling & MOT
Can light slow an atom down and also hold it in place?
20 minQuantum & fields
Homodyne Quantum Tomography
Can you draw a quantum state from detector noise?
20 minQuantum & fields
Quantum Phase Metrology
Do sharper interference fringes always mean a better phase measurement?
20 minQuantum & fields
Coupled Spin Spectroscopy
Why can a spectral line be missing even though both levels exist?
18 minQuantum & fields
Transmon Artificial Atom
What do you give up when you make an artificial atom less sensitive to stray charge?
18 minQuantum & fields
Quantum Zeno Monitoring
Can repeated checks slow a quantum transition?
18 minQuantum & fields
Two-Level Quantum Otto Engine
Can one spin turn heat into work?
18 minQuantum & fields
Aharonov–Bohm Flux Interferometer
Can a magnetic field the electrons never pass through change which exit they take?
18 minQuantum & fields
Atom Interferometer Gravimeter
How can three laser pulses measure gravity with falling atoms?
18 minQuantum & fields
Anderson Localization
Can a wave get stuck without a wall?
20 minQuantum & fields
Bloch Oscillations
Why does a steady push make a particle in a lattice swing back and forth instead of speeding up?
20 minQuantum & fields
Trapped-Ion Sideband Spectroscopy
Why does the red sideband disappear when a trapped ion reaches its motional ground state?
25 minQuantum & fields
Cavity Quantum Excitation Exchange
Can a cavity give a photon back to the atom that emitted it?
25 minQuantum & fields
STIRAP Dark-State Transfer
How can two laser pulses transfer an atom while it almost never sits in the lossy middle state?
25 minQuantum & fields
Rydberg Atom Blockade
Why are two nearby atoms rarely excited to Rydberg states at the same time?
25 minQuantum & fields
Fluorescence & Quantum Jumps
When the detector goes quiet, has the atom really gone dark?
25 minQuantum & fields
HBT Photon Correlation
How can you tell equally bright light sources apart by the way their photons arrive?
25 minQuantum & fields
Quantum Well Spectroscopy
How much do the energy levels rise when a quantum well is made narrower?
25 minQuantum & fields
Coherent Double Well Transfer
How can a particle get into the other well without climbing over the barrier?
25 minQuantum & fields
Wave Packet & Uncertainty
Does a narrower wave packet end up spreading wider?
20 minQuantum & fields
Quantum Harmonic Oscillator
If the probability density of a quantum oscillator never changes, is its energy zero?
20 minQuantum & fields
Landau–Zener Passage
Does a slow sweep through an avoided crossing switch a two-level system into its other state?
25 minQuantum & fields
Berry Phase Interferometer
How far does an interference fringe shift when a spin is carried around a loop?
25 minQuantum & fields
Quantum Teleportation & Swapping
If the classical message is blocked, does a teleported quantum state still arrive?
25 minQuantum & fields
BB84 Key Distribution
In BB84, which bits are kept for the key after the two sides compare notes in public?
25 minQuantum & fields
Which Path & Quantum Eraser
Can sorting the hits by their which-path tags bring the interference fringes back?
25 minQuantum & fields
Weak Measurement & Conditional Pointer
To make the pointer shift bigger in a weak measurement, how many events must you give up?
25 minQuantum & fields
Hong–Ou–Mandel Two-Photon Interference
When two photons enter a beam splitter from opposite sides, why do the two counters stop clicking together?
25 minQuantum & fields
Bell Correlations & CHSH
Can two stations whose results each look random still beat the limit of any local theory?
25 minQuantum & fields
Spin Echo & Noise Spectroscopy
Which lost coherence can a pulse bring back?
25 minQuantum & fields
Decoherence Channels & Information Loss
Does losing phase also mean losing energy?
25 minQuantum & fields
Quantum State & Born Measurement
Can two states look identical in one basis and different in another?
15 minQuantum & fields
Stern–Gerlach Sequence
Why does a middle analyzer change a repeated measurement?
15 minQuantum & fields
Rabi Pulse Calibration
How long must a pulse last to flip a state?
15 minQuantum & fields
Ramsey Frequency Measurement
Can a longer wait reveal a smaller frequency difference?
15 minQuantum & fields
Can a Particle Cross an Impossible Wall?
Why can a particle sometimes be detected beyond a barrier it classically cannot cross?
10 minQuantum & fields
Can One Particle Interfere?
How do unpredictable hits accumulate into stable fringes?
12 minQuantum & fields
How a Field Becomes Quantized
How can a continuous field produce discrete particle excitations?
15 minQuantum & fields
SSH Chain & Edge States
Is a particle trapped at the edge of an SSH chain always in a topological state?
20 minQuantum & fields
Chern Insulator · Follow the Edge
When the edge of a Chern insulator lights up, does the wave really travel along it?
25 minQuantum & fields
Haldane Lattice · Turn the Phase
If you reverse the hopping phase in a Haldane lattice, does the edge carry waves the other way?
25 minQuantum & fields
Cavity Photon Counting & Feedback
When can atoms passing through a cavity reveal its photon number, and when can delayed feedback keep that number steady?
25 minQuantum & fields
Zeeman Atomic-beam Slower
Which atoms does a Zeeman slower actually slow down, and what can the glow of atoms at its exit prove?
22 minQuantum & fields
Two-Ion Quantum Logic Spectroscopy
How can you take the spectrum of one ion by watching the light from another ion beside it?
25 minQuantum & fields
Three-Photon GHZ Correlation Bench
How can three photons whose individual results are random still beat every local explanation?
25 minQuantum & fields
Single-Electron Penning Trap & Spin Readout
How can the spin of a single trapped electron be read from the frequency of its motion?
25 minQuantum & fields
Molecular-Beam Proton Magnetic Moment
How can a beam of hydrogen molecules measure the proton's magnetic moment when the molecules' rotation is magnetic too?
25 minQuantum & fields
Hydrogen–Deuterium Isotope Spectrometer
Why do hydrogen and deuterium emit their spectral lines at slightly different wavelengths?
20 minQuantum & fields
Two-Isotope Doppler Thermometer
How can two hydrogen isotopes give a gas temperature when the spectrometer also blurs the lines?
20 minQuantum & fields
Compton Angular Spectrometer
How does a scattered photon's energy change with angle, and what does that reveal?
20 minQuantum & fields
Compton Coincidence Energy Analyzer
Do the scattered photon and the recoiling electron together carry all of the incoming photon's energy?
20 minQuantum & fields
Continuous-wave NMR Spectrometer
How do you find the center and width of a nuclear resonance with a continuous radio-frequency scan?
20 minQuantum & fields
NMR Power Saturation Analyzer
Why does the absorption signal of a nuclear resonance shrink when the radio-frequency drive gets too strong?
20 minQuantum & fields
NMR Free Induction Spectrometer
What can the fading voltage after a radio-frequency pulse tell you about the nuclear spins?
20 minQuantum & fields
NMR Inversion Recovery Relaxometer
How do you measure how fast nuclear magnetization recovers after it is flipped?
20 minQuantum & fields
Optical Pumping and Relaxation
How can light measure how fast atoms relax in the dark?
20 minQuantum & fields
Hanle Lifetime Spectrometer
How can a magnetic field measure how long an excited atom lives?
20 minQuantum & fields
Oil-Drop Charge Measurement
How can the way an oil drop moves reveal its electric charge?
20 minQuantum & fields
Atomic Magnetic-Moment Comparator
How can you measure the electron's spin factor without knowing the magnetic field?
20 minQuantum & fields
Zeeman Polarization Spectrometer
What does a spectral line look like in a magnetic field, viewed across and along the field?
20 minQuantum & fields
Canal-Ray Doppler Spectrometer
How does the light from fast-moving hydrogen atoms reveal their speed?
20 minQuantum & fields
Stark Splitting Spectrometer
How can a split hydrogen line measure an electric field?
20 minQuantum & fields
Lamb Shift Microwave Bench
How can microwaves find the Lamb shift in hydrogen?
20 minQuantum & fields
Mössbauer Doppler Observatory
Why can a source moving a few millimeters per second resolve tiny shifts in nuclear energy levels?
20 minQuantum & fields
Blackbody Radiation Observatory
Can one temperature and one emissivity explain the measured spectrum?
18 minQuantum & fields
The Matter-Wave Antilaser
How does the relative phase of two matter waves decide whether a lossy site swallows them?
16 minQuantum & fields
A Cut That Moves Every Mode
Why does cutting one link in a ring where hopping favors one direction push every mode to one edge?
16 minQuantum & fields
When a Molecular Bond Breaks
Why can a kicked molecular bond break when an ideal spring of the same stiffness always pulls back?
18 minQuantum & fields
Through a Conical Intersection
What happens to a molecular wavepacket when it passes the point where two energy surfaces touch?
18 minQuantum & fields
A Quantum Newton’s Cradle
Why do two colliding atom clouds keep returning to their starting shape in a harmonic trap but not in a distorted one?
18 minQuantum & fields
When Matter-Wave Solitons Collide
What decides whether two colliding matter-wave solitons make a bright peak or a dark gap where they meet?
18 minQuantum & fields
Build an Atomic Corral
Why does a ring of atoms on a metal surface make the surface electrons form rings of standing waves?
18 minQuantum & fields
A Quantum Mirage at an Empty Focus
Can an atom at one focus of an elliptical corral change the electrons at the other, empty focus?
18 minQuantum & fields
A Giant Atom Hears Its Echo
What happens when an atom coupled to a waveguide at two distant points meets its own emitted wave again?
18 minQuantum & fields
A Photon Cloud That Cannot Escape
Why does an excited atom tuned into a waveguide's band gap keep part of its excitation instead of emitting it all?
18 minQuantum & fields
Dynamical Casimir Photon Pairs
How can you tell that a modulated boundary emits photons in pairs, when each mode alone looks like thermal noise?
18 minQuantum & fields
Single-Atom Photon Blockade
How can one atom in a cavity keep a second photon out once the first is inside?
18 minQuantum & fields
Andreev Reflection
What comes back when an electron hits a superconductor with an energy inside its gap?
18 minQuantum & fields
Majorana End Modes
Why does a superconducting wire with a gapped interior show zero-energy states at its ends?
18 minQuantum & fields
Airy Matter Waves
How can the brightest crest of a free matter wave curve when no force acts on it?
16 minQuantum & fields
Matter-Wave Lens
How can one short pulse slow or refocus a spreading matter wave?
16 minQuantum & fields
Quantum Billiards
How does the shape of a quantum billiard change the pattern a reflected wave makes?
18 minQuantum & fields
Quantum Time Mirror
Can a scattered wave be gathered back into exactly its starting state?
18 minQuantum & fields
Perfect Quantum State Transfer
How can a chain with fixed couplings deliver an excitation to the far end with certainty?
18 minQuantum & fields
Rydberg Many-Body Scars
Does an interacting chain of atoms always forget the pattern it started in?
18 minQuantum & fields
Aharonov–Bohm Quantum Cage
How can a magnetic flux trap a particle in a diamond chain without walls?
18 minQuantum & fields
Repulsively Bound Atom Pair
How can two atoms that repel each other move together as a pair?
18 minQuantum & fields
Dicke Superradiant Burst
Why can a group of excited atoms release its light in one bright burst?
18 minQuantum & fields
Subradiant Atomic Array
How can neighboring atoms keep an excitation from radiating away so quickly?
18 minQuantum & fields
Dirac Trembling Motion
Why does a free Dirac wave packet tremble when no force acts on it?
18 minQuantum & fields
Klein Wave-Packet Tunnelling
Why can a higher barrier let a Dirac wave packet through when a lower one reflects it?
18 minQuantum & fields
Kerr Cats & Wigner Interference
How can one wave packet of light end up in several places at once?
18 minQuantum & fields
Quantum Backflow on a Ring
Can the probability current on a ring flow backward when every momentum points forward?
18 minQuantum & fields
Quantum Walk & Phase Traps
How does a quantum walk differ from an ordinary random walk?
18 minQuantum & fields
Quantum Kicks & Dynamical Localization
If you keep kicking a quantum rotor, can its momentum stop spreading?
18 minQuantum & fields
Quantum Carpet & Revivals
Why does a wave spreading in a box come back to its starting shape?
18 minQuantum & fields
Molecular Alignment Revivals
Why do molecules line up again long after the laser pulse has passed?
18 minQuantum & fields
Matter-Wave Collision
What happens when two clouds of condensed atoms overlap?
20 minQuantum & fields
Quantum Vortex Studio
How can you tell that a hole in a condensate is a quantized vortex?
20 minQuantum & fields
Bose–Hubbard · Count the Fluctuations
What happens to atoms in a lattice as their repulsion grows?
25 minQuantum & fields
Fermi–Hubbard · Read the Spin Neighbors
Why do neighbors prefer opposite spins?
25 minQuantum & fields
Hofstadter Lattice · Split a Band
How much flux does it take to turn one band into several?
25 minQuantum & fields
Magnetic Edge · Find the Boundary State
Which states move along the boundary instead of filling the sample?
25 minQuantum & fields
How to Read a Particle Collision
How do physicists reconstruct a collision they cannot see from what the detector records?
18 minQuantum & fields
How a Knot Becomes a Quantum-Field Observable
Why does the expectation value of a Wilson loop depend only on the knot type, not on how the knot is drawn?
18 minQuantum & fields
Crossing Symmetry: One Four-Point Function, Two Expansions
Does the same operator data give the same correlator when you expand around either pair of points?
20 minQuantum & fields
Conformal Bootstrap Bound: A Linear Functional Excludes a Gap
Can one linear functional show that no consistent 1D theory has a gap this large?
20 minQuantum & fields
Quantum Critical Ising Chain: The Same Pattern at Every Scale
Why does a critical spin chain look the same on a ring of 16 spins and a ring of 256?
20 minQuantum & fields
2D Ising Bootstrap Bound: Does the Kink Survive the Truncation?
Is the 2D Ising model really at the edge of the bootstrap bound, or is that an artefact of how the problem was cut down?
20 min
No experiments found.
Latest Labs
Recent additionsTransit Timing Variations and Planet Masses
Motion & dynamical systemsRadial Velocities, Active Stars and Binary Masses
Motion & dynamical systemsEclipses and Transit Photometry
Waves & optics
Earlier releases
Debris Disk Sculpting
Motion & dynamical systemsPlanet Migration, Disk Torques and Resonance
Motion & dynamical systemsProtoplanetary Dust Traps
Motion & dynamical systemsPlanetary Atmospheric Escape
Motion & dynamical systemsTidal Heating and Locking
Motion & dynamical systemsComet Dust Tails and Radiation Pressure
Motion & dynamical systemsPlanetary Ring Waves
Motion & dynamical systemsKozai–Lidov Cycles
Motion & dynamical systemsLight Signals in Global AdS
Quantum & fieldsAdS Interval Entanglement
Quantum & fieldsBoundary Quantum Error Correction
Quantum & fieldsObserving Cadence and Aliases
Waves & opticsSupernova Distances and the Distance Ladder
Waves & opticsGalaxy Colors and Photometric Redshift
Waves & opticsStellar Interferometry and Sparse Imaging
Waves & opticsInterstellar Radio Propagation
Waves & opticsStellar Parallax and Proper Motion
Waves & opticsCrowded-star Photometry
Waves & opticsStellar Absorption Lines
Waves & opticsElectric Double-Layer Charging
Fields, fluids & matterConcentration Polarization and Space Charge
Fields, fluids & matterInduced-Charge Electro-osmosis
Fields, fluids & matterElectrochemical Impedance Inference
Fields, fluids & matterPhoton Echo Pulse Sequence
Quantum & fieldsCoupled Vibrations in Two-Dimensional IR
Waves & opticsSpectral Diffusion and Frequency Memory
Waves & opticsFree Energy Hides a Dimension
Fields, fluids & matterUmbrella Sampling and MBAR
Fields, fluids & matterSame Free Energy, Different Clock
Fields, fluids & matterThree Ways Through an Avoided Crossing
Quantum & fieldsGeometric Phase Around a Conical Intersection
Quantum & fieldsBenchmark Nonadiabatic Reaction Methods
Quantum & fieldsBuild a Self-Consistent Hydrogen Molecule
Quantum & fieldsWhy Hartree–Fock Struggles to Break a Bond
Quantum & fieldsMap Electronic-Structure Errors Along a Bond
Quantum & fieldsOptomechanical Sideband Cooling
Quantum & fieldsContinuous Optomechanical Measurement
Quantum & fieldsOptomechanical Photon Blockade
Quantum & fieldsTwo-Photon Waveguide Scattering
Quantum & fieldsStructured Bath and Output Ports
Quantum & fieldsQuantum Node Photon Collection
Quantum & fieldsJoint Spectral Phase & Photon Purity
Quantum & fieldsQuantum Pulse Gate
Quantum & fieldsOne Sky and Cosmic Variance
Waves & opticsCMB Acoustic Peaks
Waves & opticsCosmology, Likelihoods and Priors
Waves & opticsNuclear Spectra and Collective Motion
Quantum & fieldsNuclear Optical Potential
Quantum & fieldsStellar Reaction Rates
Quantum & fieldsBjorken Expansion
Quantum & fieldsHydrodynamic Attractor
Quantum & fieldsFrom Eccentricity to Collective Flow
Quantum & fieldsQGP Transport Inference
Quantum & fieldsGluon Scattering Amplitudes
Quantum & fieldsS-matrix Bootstrap
Quantum & fieldsDecay Chain Counter
Quantum & fieldsProton Form Factors
Quantum & fieldsNuclear Shell Filling
Quantum & fieldsWeak Decay and the Mirror Test
Quantum & fieldsNeutral Kaons in Flight
Quantum & fieldsInside the Proton
Quantum & fieldsConical Pendulum
Motion & dynamical systemsCentrifugal Governor
Motion & dynamical systemsTransistor Bias and Output Curves
Fields, fluids & matterHeterojunction Injection
Fields, fluids & matterBlue LED: Recombination and Efficiency
Fields, fluids & matterCCD: Follow the Charge
Fields, fluids & matterGMR Spin Valve
Fields, fluids & matterSQUID: Flux into Voltage
Quantum & fieldsJosephson Switching Statistics
Quantum & fieldsSuperconductors in a Magnetic Field
Quantum & fieldsSpontaneous Raman Spectrometer
Waves & opticsOptical Tweezers: Brownian Calibration
Waves & opticsAttosecond RABBIT Metrology
Waves & opticsNeutron Triple-Axis Spectrometer
Fields, fluids & matterRadio Echoes from the Ionosphere
Waves & opticsPantograph Drawing Copier
Motion & dynamical systemsScissor Lift & Virtual Work
Motion & dynamical systemsTusi Couple & Inner Rolling Tracer
Motion & dynamical systemsOuter Rolling Tracer
Motion & dynamical systemsThe Matter-Wave Antilaser
Quantum & fieldsA Cut That Moves Every Mode
Quantum & fieldsCam Motion Designer
Motion & dynamical systemsCrank-Shaper Quick Return
Motion & dynamical systemsPeaucellier Inversor
Motion & dynamical systemsTrammel of Archimedes
Motion & dynamical systemsWhen a Molecular Bond Breaks
Quantum & fieldsThrough a Conical Intersection
Quantum & fieldsA Quantum Newton’s Cradle
Quantum & fieldsWhen Matter-Wave Solitons Collide
Quantum & fieldsBuild an Atomic Corral
Quantum & fieldsA Quantum Mirage at an Empty Focus
Quantum & fieldsUniversal Joint
Motion & dynamical systemsOldham Coupling
Motion & dynamical systemsGeneva Drive
Motion & dynamical systemsScotch Yoke
Motion & dynamical systemsA Giant Atom Hears Its Echo
Quantum & fieldsA Photon Cloud That Cannot Escape
Quantum & fieldsDynamical Casimir Photon Pairs
Quantum & fieldsSingle-Atom Photon Blockade
Quantum & fieldsFour-Bar Linkage
Motion & dynamical systemsSlider-Crank Workshop
Motion & dynamical systemsCart-Pole Balance
Motion & dynamical systemsReaction-Wheel Balance
Motion & dynamical systemsTwo-Ion Quantum Logic Spectroscopy
Quantum & fieldsThree-Photon GHZ Correlation Bench
Quantum & fieldsRolling Wheel & Geometric Phase
Motion & dynamical systemsChaplygin Sleigh
Motion & dynamical systemsCavity Photon Counting & Feedback
Quantum & fieldsZeeman Atomic-beam Slower
Quantum & fieldsSingle-Electron Penning Trap & Spin Readout
Quantum & fieldsMolecular-Beam Proton Magnetic Moment
Quantum & fieldsAndreev Reflection
Quantum & fieldsMajorana End Modes
Quantum & fieldsHydrogen–Deuterium Isotope Spectrometer
Quantum & fieldsTwo-Isotope Doppler Thermometer
Quantum & fieldsChladni Plate Resonance
Motion & dynamical systemsDrum Modes & Strike Position
Motion & dynamical systemsAiry Matter Waves
Quantum & fieldsMatter-Wave Lens
Quantum & fieldsCompton Angular Spectrometer
Quantum & fieldsCompton Coincidence Energy Analyzer
Quantum & fieldsQuantum Time Mirror
Quantum & fieldsQuantum Billiards
Quantum & fieldsContinuous-wave NMR Spectrometer
Quantum & fieldsNMR Power Saturation Analyzer
Quantum & fieldsTidal Field Explorer
Motion & dynamical systemsPerfect Quantum State Transfer
Quantum & fieldsRydberg Many-Body Scars
Quantum & fieldsNMR Free Induction Spectrometer
Quantum & fieldsNMR Inversion Recovery Relaxometer
Quantum & fieldsPlanetary Gears & Two Inputs
Motion & dynamical systemsGear Train & Idler
Motion & dynamical systemsAharonov–Bohm Quantum Cage
Quantum & fieldsRepulsively Bound Atom Pair
Quantum & fieldsDicke Superradiant Burst
Quantum & fieldsSubradiant Atomic Array
Quantum & fieldsOptical Pumping and Relaxation
Quantum & fieldsHanle Lifetime Spectrometer
Quantum & fieldsSwinging Spring & Internal Resonance
Motion & dynamical systemsOil-Drop Charge Measurement
Quantum & fieldsAtomic Magnetic-Moment Comparator
Quantum & fieldsZeeman Polarization Spectrometer
Quantum & fieldsCanal-Ray Doppler Spectrometer
Quantum & fieldsDirac Trembling Motion
Quantum & fieldsKlein Wave-Packet Tunnelling
Quantum & fieldsN-Body Star Cluster
Motion & dynamical systemsLagrange Points & Three-Body Channels
Motion & dynamical systemsStacked Blocks & Friction
Motion & dynamical systemsFree-Body Diagram Builder
Motion & dynamical systemsKerr Cats & Wigner Interference
Quantum & fieldsQuantum Backflow on a Ring
Quantum & fieldsStark Splitting Spectrometer
Quantum & fieldsLamb Shift Microwave Bench
Quantum & fieldsMössbauer Doppler Observatory
Quantum & fieldsBouncing Ball & Restitution
Motion & dynamical systemsSpring Launcher
Motion & dynamical systemsQuantum Kicks & Dynamical Localization
Quantum & fieldsQuantum Walk & Phase Traps
Quantum & fieldsBlackbody Radiation Observatory
Quantum & fieldsMolecular Alignment Revivals
Quantum & fieldsQuantum Carpet & Revivals
Quantum & fieldsQuantum Vortex Studio
Quantum & fieldsMatter-Wave Collision
Quantum & fieldsCenter-of-Momentum Frame Lab
Motion & dynamical systemsGalilean Frame Switcher
Motion & dynamical systemsTerminal Fall & Drag Laws
Motion & dynamical systemsElevator Scale & Apparent Weight
Motion & dynamical systemsFermi–Hubbard · Read the Spin Neighbors
Quantum & fieldsBose–Hubbard · Count the Fluctuations
Quantum & fieldsMotion Measurement & Numerical Differentiation
Motion & dynamical systemsMotion Graph Studio
Motion & dynamical systemsConservative Forces & Path Dependence
Motion & dynamical systemsWork–Energy Graph Studio
Motion & dynamical systemsMagnetic Edge · Find the Boundary State
Quantum & fieldsHofstadter Lattice · Split a Band
Quantum & fieldsPolar-Coordinate Kinematics
Motion & dynamical systemsCurvature & Frenet Track Designer
Motion & dynamical systemsHaldane Lattice · Turn the Phase
Quantum & fieldsChern Insulator · Follow the Edge
Quantum & fieldsLong-Baseline CP Observatory
Fields, fluids & matterBraking Distance & Power Limits
Motion & dynamical systemsCrash Pulse & Impulse Engineering
Motion & dynamical systemsThouless Transport Pump
Quantum & fieldsSSH Chain & Edge States
Quantum & fieldsNeutrino Sky Search Observatory
Fields, fluids & matterVirial Theorem Observatory
Motion & dynamical systemsGravity Field & Shell Theorem
Motion & dynamical systemsSpin Squeezing Metrology
Quantum & fieldsQuantum Spin Chain Quench
Quantum & fieldsBeta Energy Sharing Observatory
Fields, fluids & matterDouble Beta Decay Observatory
Fields, fluids & matterQuantum State & Process Tomography
Quantum & fieldsQuantum Error Correction
Quantum & fieldsCycloid Challenge: Fastest & Isochronous
Motion & dynamical systemsRoller-Coaster Energy Designer
Motion & dynamical systemsSingle-particle Cryo-EM: From Movies to a Map
Fields, fluids & matterStress–Strain Material Tester
Motion & dynamical systemsColumn Buckling & Imperfection
Motion & dynamical systemsIdentical Atom Exchange
Quantum & fieldsQuantum Gas Occupation
Quantum & fieldsPhotoelectron Structure: Direction and Depth
Fields, fluids & matterBeta Endpoint Mass Observatory
Fields, fluids & matterUltrafast TEM: Resolve Time Without Losing Counts
Fields, fluids & matterMulti-beam SEM: Calibrate Before Stitching
Fields, fluids & matterReactor Near–Far Spectra
Fields, fluids & matterHydrogen Orbitals & Spectra
Quantum & fieldsPartial-Wave Scattering
Quantum & fieldsElectron Ptychography: Recover Phase from Overlap
Fields, fluids & matterAberration Corrector: Tune the Electron Probe
Fields, fluids & matterShallow-Water Waves & Dam Break
Motion & dynamical systemsBuoyancy & Metacentric Stability
Motion & dynamical systemsMicroED: Rotate, Integrate, Fit the Basis
Fields, fluids & matterCBED: Thickness and Crystal Symmetry
Fields, fluids & matterSurface Tension & Capillary Laboratory
Motion & dynamical systemsRotational Rheometer & Couette–Poiseuille Flow
Motion & dynamical systemsFranck–Hertz Excitation
Quantum & fieldsLaser Cooling & MOT
Quantum & fieldsTunable Laser & Mode-Hop-Free Scan
Waves & opticsExternal Feedback & Laser Chaos
Waves & opticsMicroresonator Kerr Comb
Waves & opticsCoherent Beam Combining
Waves & opticsSiphon, Pressure Limit & Cavitation
Motion & dynamical systemsContinuity & Bernoulli Flow Bench
Motion & dynamical systemsCryo Electron Tomography: Spend Dose, Average Copies
Fields, fluids & matterElectron Tomography: Reconstruct the Missing View
Fields, fluids & matterNeutrino Matter Resonance
Fields, fluids & matterResonant Tunneling Transport
Quantum & fieldsGravitational Quantum Bouncer
Quantum & fieldsThermal Lensing & High-Power Scaling
Waves & opticsRandom Laser
Waves & opticsDraining Tank & Torricelli Law
Motion & dynamical systemsHydrostatics & Hydraulic Press
Motion & dynamical systemsSupernova Neutrino Burst Observatory
Fields, fluids & matterHomodyne Quantum Tomography
Quantum & fieldsQuantum Phase Metrology
Quantum & fieldsCryo-SEM: Preserve Before You Observe
Fields, fluids & matterEnvironmental SEM: Keep Water, Control Charge
Fields, fluids & matterLiquid Argon Time Projection Chamber
Fields, fluids & matterLaser Linewidth & Phase Noise
Waves & opticsPound–Drever–Hall Frequency Lock
Waves & opticsTransmon Artificial Atom
Quantum & fieldsCoupled Spin Spectroscopy
Quantum & fieldsElectron Lithography: Draw, Expose, Develop
Fields, fluids & matterFIB Lamella: From Bulk to TEM Grid
Fields, fluids & matterBeam Bending Laboratory
Motion & dynamical systemsTruss Bridge Force Explorer
Motion & dynamical systemsSTEM Detectors: Phase and Column Contrast
Fields, fluids & matterSTEM-in-SEM: Through a Thin Specimen
Fields, fluids & matterSolar Neutrino Flavor Observatory
Fields, fluids & matterInjection Locking
Waves & opticsRaman & Brillouin Lasers
Waves & opticsTwo-Level Quantum Otto Engine
Quantum & fieldsQuantum Zeno Monitoring
Quantum & fieldsCenter of Mass & Tipping
Motion & dynamical systemsPrecision Balance and Air Buoyancy
Motion & dynamical systemsTKD: Through the Nanocrystal
Fields, fluids & matterEBSD: From Bands to Grains
Fields, fluids & matterAtom Interferometer Gravimeter
Quantum & fieldsAharonov–Bohm Flux Interferometer
Quantum & fieldsNonlinear Frequency Conversion
Waves & opticsRegenerative & Multipass Amplifier
Waves & opticsBloch Oscillations
Quantum & fieldsAnderson Localization
Quantum & fieldsAtmospheric Neutrino Zenith Experiment
Fields, fluids & matterCapstan & Belt Friction
Motion & dynamical systemsCatenary & Suspension Cable
Motion & dynamical systemsLow-energy SEM: Slow at the Surface
Fields, fluids & matterBSE: Composition or Orientation?
Fields, fluids & matterInverse Photoemission: Empty States
Fields, fluids & matterAuger Spectra: What Sputtering Leaves Behind
Fields, fluids & matterChirped Pulse Amplification
Waves & opticsTi:Sapphire Ultrafast Oscillator
Waves & opticsPulley Network & Mechanical Advantage
Motion & dynamical systemsAtwood Machine
Motion & dynamical systemsNeutrino Flavor Propagation
Fields, fluids & matterCavity Quantum Excitation Exchange
Quantum & fieldsTrapped-Ion Sideband Spectroscopy
Quantum & fieldsBlock-face SEM: Between the Cuts
Fields, fluids & matterFIB-SEM: From Slices to Volume
Fields, fluids & matterFiber Laser & FBG Cavity
Waves & opticsDFB, DBR & VCSEL Architectures
Waves & opticsSTIRAP Dark-State Transfer
Quantum & fieldsRydberg Atom Blockade
Quantum & fieldsAccelerating Wedge & Sliding Block
Motion & dynamical systemsInclined Plane & Friction
Motion & dynamical systemsEnvironmental-cell TEM: Bubbles and Pressure
Fields, fluids & matterIn-situ TEM: Stimulus or Beam?
Fields, fluids & matterSemiconductor Laser Diode
Waves & opticsLaser Medium Zoo
Waves & opticsAngular-Momentum Skater
Motion & dynamical systemsMoment-of-Inertia Designer
Motion & dynamical systemsElectron Holography: Recover the Hidden Phase
Fields, fluids & matterLorentz TEM: Where the Walls Appear
Fields, fluids & matterGranular Impact Chain Designer
Motion & dynamical systemsHow Coupled Springs Move Together
Motion & dynamical systemsFluorescence & Quantum Jumps
Quantum & fieldsHBT Photon Correlation
Quantum & fieldsMode Locking
Waves & opticsOptical Frequency Comb
Waves & opticsLaser Dynamics & Relaxation Oscillation
Waves & opticsQ-Switched Giant Pulse
Waves & opticsQuantum Well Spectroscopy
Quantum & fieldsCoherent Double Well Transfer
Quantum & fieldsWhy a Spinning Ball Curves
Fields, fluids & matterProjectile Flight Designer
Motion & dynamical systemsIceCube: From Sensor Hits to a Track
Fields, fluids & matterCherenkov Light & Detector Rings
Fields, fluids & matterReactor Antineutrino Coincidence
Fields, fluids & matterPrecession Diffraction: From Spots to Grains
Fields, fluids & matterDynamical Diffraction: When Intensity Returns
Fields, fluids & matterAlignment & Mode Matching
Waves & opticsOutput Coupler Optimization
Waves & opticsWave Packet & Uncertainty
Quantum & fieldsQuantum Harmonic Oscillator
Quantum & fieldsDouble-Well, Barrier & Separatrix Lab
Motion & dynamical systemsOne-Dimensional Potential Landscape
Motion & dynamical systemsVibrational EELS: Resolution & Aloof Probes
Fields, fluids & matterCathodoluminescence: Where Light Is Born
Fields, fluids & matterBallistic Pendulum Lab
Motion & dynamical systemsFree Fall & Measuring Gravity
Motion & dynamical systemsTransverse Laser Modes
Waves & opticsGaussian Beam & Beam Quality
Waves & opticsLandau–Zener Passage
Quantum & fieldsBerry Phase Interferometer
Quantum & fieldsSTEM-EDS: Nanochemical Maps
Fields, fluids & matterSEM Microanalysis: EDS & WDS
Fields, fluids & matterQuantum Teleportation & Swapping
Quantum & fieldsBB84 Key Distribution
Quantum & fieldsGain Curve Meets Longitudinal Modes
Waves & opticsStable Resonator Geometry
Waves & opticsYo-Yo & Spool Direction Puzzle
Motion & dynamical systemsRolling Race Laboratory
Motion & dynamical systemsQuantum Phase Estimation
Quantum & fieldsGrover Amplitude Amplification
Quantum & fieldsLEEM: Measure Island Growth
Fields, fluids & matterPEEM: Thresholds & Magnetic Domains
Fields, fluids & matterBuild & Debug Your First Laser
Waves & opticsLaser Diagnostic Bench
Waves & opticsTwo-Dimensional Collision Table
Motion & dynamical systemsOne-Dimensional Collision Bench
Motion & dynamical systemsWhich Path & Quantum Eraser
Quantum & fieldsWeak Measurement & Conditional Pointer
Quantum & fieldsHong–Ou–Mandel Two-Photon Interference
Quantum & fieldsBell Correlations & CHSH
Quantum & fieldsMomentum Microscopy: Time-of-Flight Cube
Fields, fluids & matterSingle-Pass Optical Amplifier
Waves & opticsPassive Optical Resonator
Waves & opticsLaser Noise Startup Workbench
Waves & opticsMicro / Nano ARPES: Spots & Domains
Fields, fluids & matterFPUT Recurrence Laboratory
Motion & dynamical systemsMechanical Lattice & Dispersion
Motion & dynamical systemsTime ARPES: Pulses & Relaxation
Fields, fluids & matterSpin ARPES: Polarization & Counting
Fields, fluids & matterSpin Echo & Noise Spectroscopy
Quantum & fieldsDecoherence Channels & Information Loss
Quantum & fieldsParametric Resonance Playground
Motion & dynamical systemsTuned-Mass Damper Design
Motion & dynamical systemsLaser vs Lamp vs LED
Waves & opticsThree Light–Matter Transitions
Waves & opticsPopulation Inversion Workbench
Waves & opticsHAXPES: Depth & Buried Interfaces
Fields, fluids & matterAP-XPS: Through a Liquid Film
Fields, fluids & matterDriven Resonance & Phase Lag
Motion & dynamical systemsDamped Oscillations & Ringdown
Motion & dynamical systemsStern–Gerlach Sequence
Quantum & fieldsRabi Pulse Calibration
Quantum & fieldsRamsey Frequency Measurement
Quantum & fieldsQuantum State & Born Measurement
Quantum & fieldsDuffing Oscillator Laboratory
Motion & dynamical systemsMass–Spring Oscillator
Motion & dynamical systemsUPS: Valence Bands & Work Function
Fields, fluids & matterXPS: Elements, Chemical States & Charging
Fields, fluids & matterBead on a Rotating Hoop
Motion & dynamical systemsFinite-Amplitude Pendulum
Motion & dynamical systemsDPC: Beam Deflection & Projected Fields
Fields, fluids & matter4D-STEM: One Scan, Many Virtual Images
Fields, fluids & matterSatellite Attitude & Gravity Gradient
Motion & dynamical systemsTennis-Racket Theorem
Motion & dynamical systemsEFTEM: Energy Windows & Elemental Maps
Fields, fluids & matterEELS: Energy Loss & Thin-Specimen Signals
Fields, fluids & matterSpinning Top: Precession & Nutation
Motion & dynamical systemsGyroscope Precession Bench
Motion & dynamical systemsHRTEM Phase Contrast & CTF
Fields, fluids & matterCoriolis Turntable
Motion & dynamical systemsFoucault Pendulum & Earth Rotation
Motion & dynamical systemsChaotic Billiards Arena
Motion & dynamical systemsKicked Rotor & KAM Transition
Motion & dynamical systemsRaster Scan & Drift Recovery
Fields, fluids & matterElectron Diffraction & Reciprocal Space
Fields, fluids & matterTEM Bright Field, Dark Field & SAED
Fields, fluids & matterPrinciple of Stationary Action
Motion & dynamical systemsHamiltonian Phase Space & Integrators
Motion & dynamical systemsGravity-Assist Mission Designer
Motion & dynamical systemsHohmann Transfer Planner
Motion & dynamical systemsOrbital Rendezvous in the Hill Frame
Motion & dynamical systemsSEM Secondary-Electron Topography
Fields, fluids & matterTEM Mass–Thickness Contrast
Fields, fluids & matterPhotoemission & Hemispherical Analyzer
Fields, fluids & matterARPES Band & Fermi-Surface Mapping
Fields, fluids & matterElectron–Matter Signal Map
Fields, fluids & matterElectron Scattering & Mean Free Paths
Fields, fluids & matterVacuum, Charging & Conductive Coatings
Fields, fluids & matterElectron Dose, Noise & Damage
Fields, fluids & matterElectron Wavelength & Voltage
Fields, fluids & matterElectron Gun Workbench
Fields, fluids & matterElectron Optical Column
Fields, fluids & matterElectron Resolution & Aberration Budget
Fields, fluids & matterDriven Pendulum & Poincaré Section
Motion & dynamical systemsHow One Diaphragm Creates Three Compressible Waves
Fields, fluids & matterHow Signed Singularities Assemble Fluid Orbits
Fields, fluids & matterHow Phase Turns Flapping into Propulsion
Fields, fluids & matter