Lifecycle of a Star
Watch a star evolve from nebula to its final fate. Adjust mass to see how it determines whether a star becomes a white dwarf, neutron star, or black hole.
Supernova
Watch a massive star collapse and explode. The heavy elements forged in this explosion—like iron and gold—seed the cosmos.
Aurora Borealis
See how solar wind particles funnel along Earth's magnetic field lines to create the Northern Lights at the poles.
Galaxy Collision
Watch two spiral galaxies collide and merge over hundreds of millions of years. Stars swirl into tidal tails before settling into a single elliptical galaxy.
Black Hole Lensing
Watch light bend around a black hole, distorting the stars behind it while a glowing accretion disk warps dramatically due to extreme gravity.
Lightning
Watch electrical charge build in storm clouds and discharge as branching bolts. Tap anywhere to call down lightning.
Reaction-Diffusion
Watch organic Turing patterns emerge as two chemicals react and diffuse. These same equations explain zebra stripes, leopard spots, and seashell patterns.
Flocking
Watch birds form mesmerizing murmuration patterns using three simple rules: stay close, align direction, and avoid collisions.
Fireworks
Launch fireworks on different planets. See how gravity affects how high they soar and how fast particles fall.
Cellular Automata
Explore emergence: how complex behavior arises from simple rules. Cells live or die based on their neighbors, creating self-organizing patterns like gliders and oscillators.
Strange Attractors
Watch particles trace the mesmerizing Lorenz attractor — a beautiful demonstration of chaos theory where tiny differences lead to wildly different paths.
Levers
Balance a see-saw by dragging kids of different weights. Discover how distance from the fulcrum trades off with force.
Pulleys
Discover how pulleys create mechanical advantage. Drag the rope to lift a heavy weight with less force - but more rope to pull!
Refraction
See how light bends when passing from air into water, glass, or diamond. Drag the light source to change the angle.
Coriolis Effect
See how Earth's rotation makes moving objects appear to curve. Tap to launch balls and watch their paths deflect differently in each hemisphere.
Retrograde Motion
Watch Mars appear to move backward against the stars as Earth overtakes it on its faster inner orbit.
Pythagorean Theorem
Drag the triangle corners to explore how a² + b² always equals c² in a right triangle.
Greenhouse Effect
See how CO2 traps heat in Earth's atmosphere. Adjust CO2 levels and watch temperature rise as infrared radiation gets absorbed and re-emitted.
Food Web
Remove a species from the ecosystem and watch the cascading effects ripple through the food web.
Gears
See how connected gears trade speed for torque. A smaller output gear spins faster but lifts less weight, while a larger output gear spins slower but lifts more.
Friction
Compare how different surfaces affect stopping distance. Push blocks across ice, wood, rubber, and sandpaper to see friction in action.
Jet Engine
See how a jet engine works: air is compressed, fuel burns, and hot gas shoots out to create thrust.
Fractal Explorer
Zoom into the infinite complexity of the Mandelbrot and Julia sets. Discover how simple math creates endlessly intricate patterns.
Simple Harmonic Motion
See how a spring, pendulum, and circular motion all produce the same sine wave pattern — revealing the mathematical unity behind oscillations.
Water Cycle
Drag the sun to control temperature and watch water evaporate, form clouds, and fall as rain in this interactive water cycle simulation.
Vector Addition
Drag vectors to see how they add tip-to-tail. Explore perpendicular, opposite, and parallel cases.
Fourier Series
Build any waveform by stacking sine waves. See how square, triangle, and sawtooth waves are made from simple harmonics.
Tides
Drag the Moon around Earth to see how its gravity creates tidal bulges. Watch your location experience high and low tides as Earth rotates.
Galton Board
Drop balls through a grid of pegs and watch them form a bell curve, demonstrating how random events create a normal distribution.
Doppler Effect
Watch how an ambulance siren sounds higher as it approaches and lower as it drives away. Tap to move your listening position.
Buoyancy
Explore why objects float or sink by dragging them into water and comparing their density to water's density.
Natural Selection
Watch evolution in action with the peppered moth example. Toggle pollution to change the environment and observe how moth populations adapt over generations.
Lens and Mirrors
Explore how lenses and mirrors form images. Drag an object to see ray tracing in action and understand real vs virtual images.
Collisions
Launch balls of different masses and observe elastic vs inelastic collisions. See how momentum is always conserved while kinetic energy is only conserved in elastic collisions.
Predator-Prey
Watch population boom-bust cycles emerge as foxes hunt rabbits. Adjust birth and death rates to see how ecosystems find balance.
Ideal Gas Law
Explore how pressure, volume, and temperature relate in a gas. Adjust the piston and temperature to watch particle behavior change.
Magnetic Fields
Place bar magnets and current-carrying wires to visualize magnetic field lines using compass needles that align in real-time.
4-Stroke Engine
Watch the inner workings of a piston engine through its four-stroke cycle: intake, compression, power, and exhaust.
Seasons
Discover why we have seasons by exploring Earth's axial tilt and orbit around the Sun. See how sunlight angle changes throughout the year.
Electric Field Lines
Place positive and negative charges to see the invisible force field between them. Drag to move, double-tap to remove.
Unit Circle
Explore the unit circle by dragging a point around it and watch sine, cosine, and tangent values update in real-time.
Wave Interference
Explore how waves from two sources combine to create interference patterns with bright constructive and dark destructive regions.
Projectile Motion
Launch projectiles at different angles and velocities to explore how gravity affects their trajectory, range, and flight time.
Pendulum
Explore how length and gravity affect a pendulum's swing. Drag the bob, adjust parameters, and see the period formula in action.
Lunar Cycle
Explore moon phases, eclipses, and the lunar node precession cycle in this interactive 3D simulation.