There’s a little wonder in how things work.

Trained model & vector teardownExplore at your own pace

Where does a language model’s next token come from?

Open a genuinely trained miniature Transformer. Change token tiles, inspect real attention and vector calculations, sample a continuation, and test the limits of a confident prediction.

#language models #AI #tokens #transformers

Trainable model & experimentsExplore at your own pace

Can a machine learn the wrong pattern?

Train a real classifier on editable inspection cards. Reveal a confident mistake, repair a misleading shortcut, and freeze your model before opening its reserved test.

#machine learning #AI #data #classification

How does a CPU turn instructions into results?

Write a tiny real assembly program, watch values move through a processor’s logical parts, and stop at the instant an answer becomes stored state.

#CPU #computers #processors #programming

How does an insulated gate control a current?

Inspect a connected CMOS cutaway, build a channel, find a circuit’s operating point and follow the charge and energy behind a changing bit.

#transistors #electronics #semiconductors #logic

If a black hole traps light, what are we actually seeing?

Inspect the real EHT observation, then choose a direction in a calculated light map. Follow its exterior path, find its source and reveal two images of one tiny patch.

#black holes #light #gravity #relativity

How can a rocket move when there is no air to push against?

Open a generic engine, follow what it carries and keep every bit of expelled mass in the story. Change who measures the motion, balance the thrust terms and discover what staging actually changes.

#rockets #momentum #propulsion #space

How can falling keep a spacecraft above the ground?

Draw a velocity arrow, predict a path and compare two spacecraft on one clock. Follow a real NASA Earth map, inspect the next moment of free fall and discover why speed alone cannot make a circle.

#orbits #gravity #satellites #free-fall

How does splitting an atom help make electricity?

Look through a power plant, follow three separate water routes and trace energy across their walls. Balance the energy account, then investigate why a growing average can still hide empty trials.

#nuclear-fission #electricity #reactors #heat-transfer

Earth, Weather & Climate

How can three stations help locate an earthquake?

Watch waves emerge from a buried source, pick synthetic arrivals and reveal the location one clue at a time. Test the clocks, depth and velocity assumptions—and compare the model with real recorded evidence.

#earthquakes #seismic-waves #seismology #P-waves

Cities & Transport

How does a bridge carry a moving load?

Move a load across an inspectable steel truss. Lift its deck, catch a diagonal changing from push to pull, repair a missing restraint and follow forces all the way to the supports.

#bridges #truss #tension #compression

Earth, Weather & Climate

How can a planet warm without receiving more sunlight?

Freeze two model temperatures, change infrared transfer and release time. Follow every energy route, move the accounting boundary and compare the model with real atmospheric evidence.

#greenhouse-effect #infrared #energy-budget #climate

Chemistry & Materials

Why is one step on the pH scale a big change?

Compare a hundredfold difference, transfer a tiny aliquot, turn a virtual burette and uncover why a weak acid and a strong acid reach different pH values at equivalence.

#pH #acids #bases #logarithms

Chemistry & Materials

Where does energy go while ice melts?

Give water an energy budget. Watch its temperature and phase masses, catch a melting plateau, compare two starting states and inspect an open ice structure.

#states-of-matter #water #ice #melting

Chemistry & Materials

What makes carbon different from oxygen?

Change particle counts, pin the differences, and discover what names an element. Then prepare one-electron hydrogen states, collect possible position outcomes and match energy gaps to light.

#atoms #elements #isotopes #electrons

Interactive model & evidenceExplore at your own pace

Why do time awake and time of day both matter for sleep?

Change a fictional sleep history, catch the moment two curves meet, and separate a local clock change from a biological clock. Then follow light information from eye to brain.

#sleep #circadian-rhythm #body-clock #light

What can a vaccine leave behind after its ingredients are gone?

Open a protein-vaccine example, build a response with traceable cell lineages, and compare later encounters. Then follow the separate route from vaccine mRNA to a protein.

#vaccines #immune-memory #antigen #antibodies

How does a tiny intruder set a whole response in motion?

Follow a message from skin to lymph node, match two kinds of recognition, and inspect an actual antibody structure. Then discover what immune memory can leave ready.

#immune-system #antibodies #white-blood-cells #lymph

How does a nerve cell send a message?

Nudge a membrane, discover when a spike appears, test its recovery, and cross a chemical synapse. Then inspect a real potassium-channel structure.

#neurons #nerves #action-potential #synapse

What happens when you charge your phone?

Look through a phone, separate a battery’s layers, and trace two different journeys. One happens inside the cell. The other powers the world outside.

#batteries #lithium-ion #charging #electrons

Everyday Technology

Why is one bite hot while the next is cold?

See through a closed microwave, follow a bite around the turntable, and compare where energy arrives with where heat spreads afterward.

#microwaves #heating #conduction #turntables

How does your eye bring the world into focus?

Open a sourced 3D eye, move a target nearer, and catch the moment its light comes together. Then discover why a smaller pupil is different from better focus.

#eyes #vision #light #focus

Cities & Transport

How can a wing turn moving air into lift?

Run a virtual wind-tunnel test. Tilt a symmetric airfoil, probe both surfaces, and build the whole lift force from pressure around the wing.

#flight #wings #airflow #lift

How do driven wheels take different paths around a corner?

Follow a transparent car around a bend, open its rear axle, and discover how a differential shares motion, torque and a low-grip limit.

#differential #gears #cars #torque

Why does a solar panel’s power depend on what you connect?

Connect a realistic module to a virtual load, look inside a silicon cell, and build a day’s energy from changing light and time.

#solar #photovoltaics #silicon #electricity

Cells, Life & Evolution

How does DNA help a cell build a protein?

Take apart a human ribosome, follow a message three letters at a time, then change a DNA base and discover what the peptide does.

#dna #rna #ribosome #proteins

How do kidneys keep useful things while making urine?

Inspect real urinary anatomy, follow a glucose marker out of blood and back again, and discover three different crossings with a ledger that never loses a marker.

#kidneys #nephron #urine #filtration

Interactive model & diagramsExplore at your own pace

What does it take to turn on a light?

Close a switch. Follow a complete path. Give current a second route and discover what changes.

#circuits #current #voltage #resistance

3D cutaway & experimentExplore at your own pace

How does electricity make a motor spin?

Power a motor. Reverse its direction. Add a load and watch speed, current and turning force find a new balance.

#motors #magnetism #current #torque

Interactive model & diagramsExplore at your own pace

Where does your blood go after a heartbeat?

Turn a real anatomical model in your hands. Reveal its chambers, meet the four valves, then follow the blood moving through both sides of the heart.

#heart #circulation #valves #blood

Interactive model & diagramsExplore at your own pace

How do your lungs pull in a breath?

Move through a breath, connect space to airflow, then cross the tiny boundary where oxygen enters the blood.

#lungs #breathing #diaphragm #oxygen

Interactive model & diagramsExplore at your own pace

Physics, Light & Sound

Why does moving a lens bring things into focus?

Slide an object toward a lens. Follow the rays, find a sharp image, and discover the moment a camera becomes a magnifier.

#light #lenses #optics #camera

Interactive model & diagramsExplore at your own pace

How does a sound reach your brain?

Start with a vibration. Follow air, eardrum, tiny bones and hair cells, then see why the message reaching your brain is a different kind of signal.

#sound #hearing #waves #frequency

Interactive model & diagramsExplore at your own pace

How does a message find its way across the internet?

Send “SMALL IDEAS!” through a network. Delay a piece, lose another, and watch what the receiver can actually use.

#internet #networks #packets #TCP

Interactive model & diagramsExplore at your own pace

Earth, Weather & Climate

Where can a drop of rain go next?

Follow water above and below the surface. Pave part of the land, change evaporation, and watch the water budget rearrange.

#water #earth #weather #watershed

Math, Probability & Systems

How can random choices make a predictable shape?

Release a few virtual balls, then a thousand. Change the chance of a right turn and compare the results with a mathematical prediction.

Interactive model & diagramsExplore at your own pace

#probability #randomness #statistics #distribution

3D working model & experimentExplore at your own pace

How does a piston turn fuel into motion?

Open a detailed engine, turn its crank, and take the assembly apart. Follow four different jobs hidden inside two very similar-looking turns.

#engines #pistons #crankshaft #combustion

3D working model & experimentExplore at your own pace

How can a small pull lift a heavy load?

Rerig a dock crane. Pull the same length of rope, watch the crate rise, and see what you trade for an easier lift.

#pulleys #levers #lifting #work

A small distance.
A big internal pull.Explore the elbow’s leverage

3D working model & experimentExplore at your own pace

Why can holding a small weight need a big muscle force?

Move a load closer to an elbow on a transparent teaching arm. See the force change, then explore how muscles can work without visible movement.

#muscles #joints #biomechanics #tendons

Interactive logic workbenchExplore at your own pace

How do zeros and ones become a calculation?

Flip real input bits on a little calculator. Build a result from simple rules, and follow a carry as it crosses four columns.

#binary #logic #computers #arithmetic

3D working model & experimentExplore at your own pace

Physics, Light & Sound

How can a heavy ship float?

Load a tiny barge and watch its waterline rise along the hull. Then lower a block through a tank to connect water pressure with buoyancy.

#buoyancy #boats #density #displacement

3D working model & experimentExplore at your own pace

Cells, Life & Evolution

Where does a plant get the material to grow?

Open a leaf, explore a chloroplast, and supply a tiny carbon-building recipe. Discover what comes from air, what comes from water, and what light contributes.

#plants #carbon #photosynthesis #chloroplasts

3D working model & experimentExplore at your own pace

What happens to food after you swallow it?

Follow a meal through the gut, then zoom into its lining. Choose starch, protein or long-chain fat and discover why their next routes differ.

#digestion #food #intestines #nutrients