**Theodore Gray *is the author of The Elements, Molecules *, and Reactions, as well as Theodore Gray's Completely Mad Science. He is the creator of the bestselling iPad apps "Elements" and "Molecules," which have both been named App of the Week by Apple, and was the director of &...

**Theodore Gray *is the author of The Elements, Molecules *, and Reactions, as well as Theodore Gray's Completely Mad Science. He is the creator of the bestselling iPad apps "Elements" and "Molecules," which have both been named App of the Week by Apple, and was the director of "Disney Animated" (also honored by Apple as iPad App of the Year). Gray appeared onstage with Steve Jobs several times in his capacity as a software creator. He also co-founded Wolfram Research, Inc., makers of the widely used software Mathematica and the Wolfram Alpha website. He lives in Urbana, Illinois.

Nick Mannis a photographer specializing in taking beautiful photos of inanimate objects on black backgrounds. His other work includes* The Elements, Molecules *, and Reactions. Originally of Urbana, Illinois, he lives in Champaign, Illinois.