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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.

In this math activity, learners observe and sketch cracking patterns in pavement.

In this activity, learners use their feet to estimate distances. Learners calculate the distance of one step in centimeters by measuring 10 steps at a time to reduce measurement error.

In this activity, learners use a hand-made protractor to measure angles they find in playground equipment.

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 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.

In this activity, learners use their hands as tools for indirect measurement.