chemistry

Cooking is math. Why else would there be measuring utensils for half teaspoons, quarter teaspoons, and one-third cups? If you've ever doubled or quadrupled a recipe for a batch of cookies, you know you need to be able to add and/or multiply fractions.

I love periodic tables and TED has one of their own. When you click on an element, a video pops up describing some of the properties of the element.

TED also has a series of videos illustrating the principles of quantum mechanics. The illustrations are smartly drawn and cute.