Interactive exploration
Machines & MotionGears and gear ratios
How do gears trade speed for turning force?
Turn once. Count what happens. Discover gear ratios, real-world uses, and why different jobs need different gears.
Structure & function
The arrangement and shape of parts influence what a system can do.
Background on this ideaInteractive exploration
Machines & MotionHydraulic brakes
How does a little lever stop a spinning wheel?
Squeeze a hydraulic brake. See inside the caliper, change piston sizes, and discover how pressure becomes force.
Interactive explorationComputers, Networks & AICPUs and computer instructions
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.
Interactive explorationComputers, Networks & AITransistors and electronic switches
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.
Interactive explorationCities & TransportBridges, loads and structural strength
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.
Interactive explorationChemistry & MaterialsAcids, bases and the pH scale
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.
Interactive explorationChemistry & MaterialsSolids, liquids, gases and phase changes
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.
Interactive explorationChemistry & MaterialsAtoms and chemical elements
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.
Interactive explorationBody & HealthVaccines and immune memory
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.
Interactive explorationBody & HealthThe immune system
How does a tiny intruder set a whole response in motion?
Explore how the immune system responds to an infection. Follow immune cells from skin to lymph node, inspect an antibody structure, and discover what immune memory leaves ready.
Interactive explorationBrain & SensesNeurons and nerve signals
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.
Interactive explorationElectricity & EnergyBatteries and charging
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.
Interactive explorationBrain & SensesEyes and vision
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.
Interactive explorationElectricity & EnergySolar panels and photovoltaic cells
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.
Interactive explorationCells, Life & EvolutionDNA, genes and proteins
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.
Interactive explorationBody & HealthKidneys and urine
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.
Interactive explorationBody & HealthThe heart and blood circulation
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.
Interactive explorationBody & HealthLungs and breathing
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.
Interactive exploration
Physics, Light & SoundLenses and focusing light
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.
Interactive explorationBrain & SensesHearing and the ear
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.
Interactive explorationMachines & MotionFour-stroke engines
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.
Interactive explorationMachines & MotionLevers, pulleys and lifting
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.
A small distance.
A big internal pull.Explore the elbow’s leverage
Interactive explorationA big internal pull.Explore the elbow’s leverage
Body & HealthMuscles, joints and movement
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.
Interactive explorationComputers, Networks & AIBinary numbers and logic gates
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.
Interactive explorationPhysics, Light & SoundFloating, sinking and buoyancy
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.
Interactive explorationCells, Life & EvolutionPhotosynthesis and plant growth
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.
Interactive explorationBody & HealthDigestion and food
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.
Interactive explorationSpace & AstronomyMoon phases and eclipses
Why does the Moon seem to change shape?
Move the Moon around Earth and compare two viewpoints at once. Make a crescent, then tilt the orbit to discover why an eclipse is a special alignment.
Interactive explorationEarth, Weather & ClimatePlate tectonics and moving continents
How can moving rock leave a clock on the ocean floor?
Pull a ridge apart over millions of years. Read the age and magnetic pattern left behind, then compare spreading, sliding and subduction.
Interactive explorationEveryday TechnologyInsulation and heat transfer
How can insulation keep warmth in—and heat out?
Open a house wall. Swap its added layer, make it thicker, and reverse the temperatures to see why insulation helps in winter and summer.