Forget Mr. Wizard — it's all about Professor Joanne Manaster. A former model who worked around the world, she now teaches molecular biology at the University of Illinois. Proving that you don't need to choose between brains and beauty, she reveals the science behind some of your favorite cosmetics at her website. Here, she goes in-depth into the chemistry behind mascara. I'm willing to wager that you'll learn something you never did in science class.