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Lever Cowboy
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In this activity, learners build a figure that moves and "comes to life" when they pull its string.
Personal Fan
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Cool off in the heat with this project! Learners use simple materials to build a fan that runs on a motor.
Stroboscope
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In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary.
Breathing Blue
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In this activity, learners test exhaled breath for carbon dioxide and learn how to use an indicator as a simple way to measure pH.