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

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

In this math activity related to light, learners assemble a photometer and use it to estimate the power output of the Sun.