Find out all about the different parts of the eyes and how they work together to make vision possible.

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.

What is solar energy? Discover how we use the power of the sun, and complete this worksheet about an important renewable energy source.

During the Gold Rush, people weren't sure if they found gold or something else, and these easy steps would help them be sure.

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.