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Conservation of Momentum Classical mechanics

Discover why total momentum never changes in a collision. Adjust mass, velocity, and collision type, then watch momentum bars prove conservation in real time. Includes a challenge mode!

Conservation of Angular Momentum Classical mechanics

See how a spinning platform speeds up when you pull weights inward. Drag weights to change the moment of inertia and watch angular velocity respond — proving angular momentum is always conserved. Includes a challenge mode!

The Coriolis Effect Classical mechanics Under development

Launch projectiles on a spinning platform and watch them curve in the rotating frame while travelling in a straight line in the inertial frame. A side-by-side dual-frame view with live force vectors makes the Coriolis deflection click. Includes a target game mode!

Friction Ramp Lab Classical mechanics

Change the materials and angle to see when the brick slips. Explore how static and kinetic friction work on an inclined plane, compare material pairs, and watch force arrows and charts update in real time.

Forces Game Classical mechanics

Add the pushes in your head and pick where the puck will cross the ring. Mentally combine several force arrows acting on a top-down puck, place a prediction on a fixed ring, then watch the green net force reveal and the puck travel the proven direction. Three levels with two, three, and four forces.

Bug Hill Work Lab Classical mechanics Under development

Draw a route for a cartoon bug climbing a hill and discover the difference between force, distance, and work. Compare steep direct climbs with gentle zigzags to see why same height means same ideal work.

Planet Cannon Classical mechanics Under development

Fire a cannonball on the Moon, Mercury, Venus, Earth, or Mars and discover how gravity shapes the path. Drag the launch vector, adjust mass, and see why heavier cannonballs follow the same arc in a vacuum. Includes a Hit the Target game mode!

Fraction Playground Mathematics

Build, compare, and place fractions and decimals. Tap bars, circles, or a hundred grid to fill equal parts, drag a number line marker, and solve guided missions across three difficulty levels. Includes an explore mode!

Piano Scale Pattern Generator Music

Visual generator for piano scale patterns. Pick a root note and scale type to see the notes laid out on a keyboard diagram.

Gravitational Lens Simulator Astrophysics

See how massive objects like black holes and stars bend light from distant stars. Drag the source to discover Einstein rings, arcs, and multiple images.

Gravity Assist Simulator Astrophysics

See how spacecraft use a planet’s gravity and motion to speed up or slow down without fuel. Toggle between reference frames to discover how the slingshot maneuver really works.

Hohmann Transfer Game Astrophysics

Time your launch and burns to transfer between neighboring planets on a minimum-energy Hohmann orbit. Wait for the right planetary alignment, hold the engine for departure, coast through space, then burn again to capture orbit at the destination.

Flip and Burn Transfer Game Astrophysics

Command an Epstein drive ship on a straight-line transfer between planets. Accelerate, then choose the perfect moment to flip 180° and brake. Flip too early and you stop short; flip too late and the crew doesn’t survive the deceleration.

Time Dilation Simulator Astrophysics

A twin on Earth, a twin in a rocket — who ages less? Pick a real star, set the speed as a fraction of light, and watch two clocks tick at different rates as the Lorentz factor stretches time.

Star Lab Astrophysics

Create a star and watch it live and die. Pick from 14 real stars or dial your own mass to see the full lifecycle — from protostar to white dwarf, neutron star, or black hole. Hover over timeline phases for kid-friendly educational cards.

Gravitational Route Time Dilation Astrophysics

Fly two spacecraft from Earth to a real star along different routes past black holes. Bend each path to see how flying deeper through strong gravity makes a pilot age less. Compare onboard clocks at arrival to discover gravitational time dilation.

Copernican Reference Frame Simulator Astrophysics

Switch the center of the Solar System between the Sun, Mercury, Venus, Earth, and Mars. See how Copernicus’s heliocentric model turns complex retrograde loops into clean elliptical orbits.

Wave Interference Quantum physics

Discover how waves add up, cancel out, and create interference patterns. A step-by-step introduction to constructive and destructive interference — the foundation for understanding quantum experiments.

Double-Slit Experiment Quantum physics

Fire single photons at a barrier with slits and watch an interference pattern build up one dot at a time. Switch between one and two slits to see the difference.

Mach-Zehnder Interferometer Quantum physics

Fire single photons through a beam-splitter setup and watch quantum interference in action. Adjust the phase shift, block paths, and see how detection statistics reveal wave-particle duality.

Battery Connection Lab Electrical circuits Under development

Learn how batteries connect in series, parallel, and mixed configurations. Drag cells onto the board, test your circuit, and see the bulb respond. Includes guided lessons, challenge mode, and a free sandbox.

Current Paths Lab Electrical circuits

Explore why power grids use AC, where DC is better, and how voltage, current, power, and losses shape every electrical route. Watch charge markers flow, adjust voltage to reduce wire heat, place transformers and converters, and build complete power chains from source to device. Five modes across two families with 150 guided rounds and free-play explore.

Water Tank Negative Feedback Lab Control theory

Watch a visible mechanism compare a water level to a target and correct itself. A step-by-step introduction builds the full feedback loop from an empty tank, adding pipes, valves, sensors, and a controller one piece at a time. Add disturbances and delay to see how the system responds.

Logic Gate Trainer Computer Science

Interactive tool for learning how logic gates work — AND, OR, NOT, XOR, and more. Build circuits and see how inputs flow through gates to produce outputs.

Morse Code Practice Sheets Communications

Printable A4 practice sheets for two kids learning Morse code. One child reads a randomized list of 26 letters and transmits each one in Morse; the other writes down what they decode. Cut the page in half, hand out, and compare.