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Before there were clocks, people used shadows to tell time. In this outdoor activity, learners will discover how to tell time using only a compass, a pencil, a handy printout, and a sunny day.

You may have tried to throw a curveball or a slider, or even a screwball, with an ordinary baseball and found it difficult to do.

An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens.

In this geometry activity, learners explore networks painted on playgrounds, such as a four square court, and draw their own.

In this activity, learners use cooperation and logical thinking to find solutions to network problems on the playground.

In this activity, learners explore how polarizing sunglasses can help diminish road glare.