How things work
Light, electricity & nature
Try out light, electricity, motion and spreading. 6 works
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Batteries and Bulbs
See how series and parallel wiring change a bulb's brightness.
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Ball Throw Paths
Pick an angle and speed, throw, and compare the paths.
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Color Mixing
Light gets brighter when mixed; paint gets darker. See why.
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Wave Interference
Combine two waves and find where they reinforce each other.
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Cellular Automata
Simple rules grow into complex patterns.
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Spread Model
Change how often people meet, and compare how a made-up disease spreads.