Next time you head outside for a hike or a camping trip, bring along this checklist of animal tracks!

Where'd that shadow come from? Next time a scary shadow crosses your path, you'll know just what to look for.

Introduce children to physicist Albert Einstein — and a bit of theoretical physics — with this mini biography.

Take a plunge under the surface of the earth! With this worksheet as your guide, you may explore the geological processes of our planet.

Learners will discover what heat waves are, and how they are connected to global warming, in this two-page earth sciences worksheet.

Learn all about light refraction by simply placing your pencil in a glass of water. Warning: your pencil may not be quiet the same afterward.

Here's a great introduction to five famous astronomers for kids. See who got the star party started with this worksheet.

Introduce your flashlight to mirrors. Mirrors are cool surfaces that reflect light just as well as they reflect your face.