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Learners explore magnetism and motion as they build a simple marble run. Learners test different arrangements of plastic and cardboard tubes, bottles, and cups on a magnetic board.

In this activity (posted on March 14, 2011), learners follow the steps to construct a camera projector to explore lenses and refraction.

In this physics activity, learners build a toy with a figure that spins around like a gymnast on the high bar.

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.

In this activity, learners construct cars that are powered by hand-made, electric propellers.

In this activity, learners use simple tools to build a bookshelf with a built-in bookend.

In this activity, learners build styrofoam boats powered by twisted rubber bands.