Night Senses

Explore one nighttime forest through the senses of an owl, a dog, a snake, and a bat, and compare what each animal can detect.

v1.4.0

AstroDrop

Drop objects on Earth, the Moon, and Mars with air resistance on or off, and see how gravity pulls them down while air slows the lightest ones most.

v1.4.0

Which Way Will It Go?

Add arrows to push a puck from different sides, then watch how the forces combine to speed it up, hold it still, or turn it a new way.

v1.4.0

Beak by Beak

Trigger a drought on an island of finches and set the food supply, then watch over generations which beak shapes survive and which die out.

v1.4.0

The Breeder's Choice

Choose which birds become parents and which chicks to keep, and watch the traits you select spread through the flock over many generations.

v1.3.0

The Carbon Trail

Follow a carbon atom through air, life, oceans, and rock, choosing a path at each stop to trace how carbon moves along fast and slow routes.

v1.2.0

Reel It In

Whirl a ball on a string and set its radius and speed, then reel the string in or cut it loose to see how angular momentum changes the spin.

v1.4.0

Earth's Thermostat

Adjust the carbon dioxide level and toggle climate feedbacks, then watch Earth settle at a new steady temperature to see what drives the warming.

v1.4.0

Head to Head

Send two carts crashing on a frictionless track and change their mass, speed, and collision type to see how momentum and kinetic energy carry through.

v1.6.0

Faint or Far?

Fly Voyager 1 away from the Sun and watch it shrink and dim with distance, until it fades into just another star among the others in the sky.

v1.3.0

Under the Microscope

Collect organisms from four environments and examine their cells under a microscope to see how each cell's structure fits where it lives.

v1.6.0

The Gold Foil Mystery

Fire alpha particles at a gold foil and read the flashes on a detector ring, using the rare wide-angle bounces to locate the atom's tiny nucleus.

v1.2.0

Build a Machine

Build machines that turn sunlight, wind, water, or fuel into motion, light, sound, and electricity, and notice how energy fades so none runs forever.

v1.5.0

Washing Away

Change the rainfall and plant cover on a small island, then watch how water washes soil downhill and how much erosion carries away.

v1.4.0

The Gear Train

Connect a train of gears so the blue driver turns the orange output, and see how each gear flips the direction and changes the speed of the next.

v1.4.0

Nature's Clocks

Place a radioactive sample under a detector and watch it decay over time, then use the counts you collect to work out each isotope's half-life.

v1.4.0

Heat It Up

Warm different substances on a hot plate and change the material, mass, and energy delivered to see what makes the temperature climb fastest.

v1.2.0

Hot Pack, Cold Pack

Dissolve different chemicals in water to see which warm up and which cool down, then compare them to design the best hot or cold pack.

v1.5.0

Pythagoras All Around

Set up right triangles in ladders, kites, and ramps, then change the two shorter sides to see how they set the length of the hypotenuse.

v1.2.5

The Next Generation

Cross two parent plants, grow 100 offspring, and compare their flower color and height to see how traits pass down and vary across the group.

v1.8.0

Light and Shadows

Shine a light at different objects to see the shadows they cast, and find out which ones block the light and which let it pass through.

v1.4.0

The Invisible Pull

Test magnets against everyday objects to see which ones they pull without touching, how far the pull reaches, and how magnets attract and repel.

v1.8.0

What's that Fizz?

Mix vinegar and baking soda in an open or sealed jar and watch the scale to see whether mass changes when the gas escapes or stays trapped.

v1.3.0

Falling in Circles

Launch a planet around a star with a chosen speed and mass, then track how its speed, force, and energy change along the orbit it traces.

v1.10.0

The Timekeeper

Swing a pendulum and adjust its length, mass, and angle to watch kinetic and potential energy trade off while the total stays constant.

v1.5.0

The Working Leaf

Track a leaf through day and night as it makes sugar in the light and breaks it down around the clock, cycling oxygen and carbon dioxide.

v2.20.0

Bumper Balls

Push a ball across a pool table, changing how hard you push and which way you aim, to see how it rolls, speeds up, and bumps the other balls.

v1.4.0

Lift the Load

Lift a heavy crate with a pulley and weights, then switch pulleys to find out how a stronger one lifts the same load with fewer weights.

v1.3.0

Safety in Numbers

Release a herd into a field near predators, in a group or alone, and gather evidence on whether grouping keeps animals safer and better fed.

v1.4.0

Signs of Change

Combine mystery solids and liquids, then test what comes back to tell which pairs formed a new substance and which only mixed together.

v1.5.0

Solar Storm

Measure the radiation dose from sea level out to the Moon, and watch a solar storm compress Earth's magnetic shield and spike the exposure.

v1.4.0

Sound and Vibration Studio

Strike a bar to make it vibrate, then watch the sound waves ripple out across the room and shake a target on the far wall when they reach it.

v1.4.0

Crash Test

Run crash tests at different speeds into a wall or barrier, then read the instruments to see how much more energy a faster car carries.

v1.4.0

Shifting Skies

Spin the sky and move Earth around the Sun to see how a stick's shadow, the length of daylight, and the night sky change over a day and a year.

v1.5.0

The Restless Spring

Stretch a hanging spring and release it, then watch energy shift back and forth between motion and the spring as the block keeps oscillating.

v1.10.0

Sprout Lab

Grow a seed into a plant by giving it sunlight and water, then watch how the amounts you choose change how tall and healthy it grows.

v1.6.0

Sun and Shade

Compare how fast water, grass, road, and sand heat up in the sun, then open umbrellas to add shade and find out which surfaces stay cooler.

v1.4.0

Hot Meets Cold

Heat a metal sphere in a flame, then drop it into water, oil, or sand and watch heat flow out until the sphere and the material reach one temperature.

v1.6.0

Water Cycle Terrarium

Watch water move around a sealed terrarium as it evaporates into vapor, cools into a cloud, and falls back as rain to refill the pond.

v1.4.0

Wave Explorer

Raise ocean waves with wind, then pause to measure their amplitude, wavelength, and period and see how wind speed sets their size and spacing.

v1.5.0

Light the Lighthouse

Power a lighthouse with a wave-driven buoy, then change the wind speed to see how bigger waves carry more energy and shine the light brighter.

v1.3.0

Written in Stone

Sweep a fossil finder across a cliff to uncover four fossils, then order the animals from oldest to youngest by how deep each sits in the rock.

v1.2.0

Spin Up a Storm

Mix warm humid air, cool dry air and wind shear over the plains, then release the fronts to see which recipes build a thunderstorm and which drop a tornado.

v0.5.0-alpha

What Makes a Hydrangea Blue?

Set up an experiment with four beds of hydrangeas to find out how soil acidity and minerals change flower color.

v0.1.0-alpha

Confidence Intervals

Draw samples from a population with a known mean and see how often each sample's confidence interval captures the true mean.

v0.1.0-alpha

Confidence Intervals — Proportions

Draw samples from a population with a known proportion and see how often each sample's confidence interval captures the true proportion.

v0.1.0-alpha

The Geometry Playground

Work through nine coordinate-geometry investigations — distance, slope, polygons, circles, parabolas, and more — from a single interactive plane.

v1.0.4-beta

Earth, Sun, and Moon

Trace the Moon's phases, eclipses and the seasons from space and from a pin on Earth, to see how one tilted, turning system makes all three.

v0.1.0-alpha

Ecosystem Matter Flow

Build a small ecosystem and follow matter as it moves from the air, water and soil into living things, along the food web, and back again.

v0.8.0-alpha

Energy in Ecosystems

Build a food web, then place a small number of instruments on the model you built and read off what energy and matter actually do as they move through it.

v0.4.0-alpha

Fair or Rigged?

A coin with a hidden bias. Flip it, weigh the evidence against a fair coin, and make the call, then the truth is revealed. Judge many coins and watch how often a p-value rule is wrong.

v0.2.0-alpha

Hot Rock, Cool Shade

Perch a lizard on a desert rock beside a copper replica that cannot move, then run the day and see which one holds its body temperature steady.

v0.5.0-alpha

Mars Remembers

Work a shift at mission control. Send Curiosity to real stops across Gale Crater and spend a fixed budget of sols on laser, sensor and drill measurements. Read 749 m of Martian rock as a record of the era Earth lost.

v0.55.0-alpha

Model Distributions

Pick a distribution, Normal, Binomial, Geometric, or Poisson, shape it with a small device, generate data, and read the probability of a range in Tuva as the proportion of cases.

v0.3.0-alpha

Plate Tectonics

Drive two tectonic plates together or apart, set each to continent or ocean, and watch a mountain range or a deep trench build over millions of years.

v0.6.0-alpha

Regen Braking Lab

Load an electric delivery truck, set its speed, and run a standard regenerative-braking stop. The console reports the energy captured into the battery — log runs to discover how the energy of motion depends on mass and on speed.

v0.2.1-alpha

Bud or Egg?

Choose whether a hydra reproduces by budding or with a partner, grow 50 offspring, then bring the cold and send every offspring to Data Tools to compare the two routes.

v0.4.0-alpha

Who Survives the Hunt?

Choose a habitat and a predator, then use the animals you survey to work out how each pressure reshapes the population over hundreds of generations.

v0.4.0-alpha

Scale of the Solar System

Audit a broken model of the solar system: spot the bodies whose size, orbit, or composition breaks the pattern, say what you suspect, fix what's wrong, and publish your corrected catalog.

v0.2.0-alpha

Star Life Cycle

Pick a star, from a red dwarf to a forty solar mass giant, or pair one with a partner, and play out its whole life. A periodic table fills in beside it with the elements that star releases into space, and it keeps filling across every star you run.

v0.9.0-alpha

A Frog's Year

Change the kind of year a wood frog has to live through, then run it. The frog acts on instinct, not on a plan, and each kind of year puts a different part of its body under strain.

v1.0.0-alpha

The Pool That Disappears

Shape a woodland pool, choose which animals go into it, then run a whole year to find out how many of each are left, and which the pool cannot support at all.

v0.4.0-alpha

PhET Simulations (PhET-iO)

phet-io-wrapper.html

15 configured:

• Projectile Data Lab v1.0 · streaming
• Gas Properties v1.1 · button
• Circuit Construction Kit: DC v1.4 · button
• Forces and Motion: Basics v2.6.0 · streaming
• Gravity and Orbits v1.6 · button
• Energy Skate Park: Basics v1.5 · streaming
• Energy Skate Park v1.5 · streaming
• My Solar System v1.3 · streaming
• Greenhouse Effect v1.3 · streaming
• Kepler's Laws v1.2 · button
• Diffusion v1.1 · streaming
• Resistance in a Wire v1.7 · button
• Generator v1.0 · streaming
• Faraday's Electromagnetic Lab v1.0 · streaming
• Membrane Transport v1.0 · streaming

Vernier Sensors (Go Direct)

vernier-wrapper.html

12 configured:

• Go Direct CO₂ Gas streaming
• Go Direct Light and Color streaming
• Go Direct Weather streaming
• Go Direct Sound streaming
• Go Direct Gas Pressure streaming
• Go Direct O₂ Gas streaming
• Go Direct Motion streaming
• Go Direct Force and Acceleration streaming
• Go Direct Optical Dissolved Oxygen streaming
• Temperature Sensor mock streaming
• Motion Detector mock streaming
• Force Sensor mock button