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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.

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.

This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.

In this activity, learners make a photographic image—without a camera!

With little more than a plastic bottle, some vinyl tubing, and a length of PVC pipe, make a rocket and a rocket launcher and investigate how rockets fly.

This is an activity to do when there is a solar eclipse!

Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

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

In this physics activity, learners conduct two experiments to explore free-falling.

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

In this activity, learners build large-scale structures and cantilevers in a series of "building out" challenges with garden poles and tape.