Theodore Gray is the author of The Elements, Molecules, and Reactions as well as Theodore Gray's Completely Mad Science, How Things Work, and Engines. He is the creator of the bestselling iPad apps "Elements" and "Molecules," which have both been named App of the Week by Apple, and he was the director of "Disney Animated," also honored by Apple as iPad App of the Year. He co-founded Wolfram Research, Inc., makers of the widely used software Mathematica and the the Wolfram Alpha website. He lives in Urbana, Illinois.Nick Mann is a photographer specializing in taking beautiful photos of inanimate objects on black backgrounds. His other work includes The Elements, Molecules, Reactions, How Things Work and Engines. In his other life, he designs and makes specialized note-taking fieldwork equipment and he works in the quality control department for a large automotive company. He lives in Urbana, Illinois.

Theodore Gray is the author of The Elements, Molecules, and Reactions as well as Theodore Gray's Completely Mad Science, How Things Work, and Engines. He is the creator of the bestselling iPad apps "Elements" and "Molecules," which have both been named App of the Week by Apple, and he was the director of "Disney Animated," also honored by Apple as iPad App of the Year. He co-founded Wolfram Research, Inc., makers of the widely used software Mathematica and the the Wolfram Alpha website. He lives in Urbana, Illinois.Nick Mann is a photographer specializing in taking beautiful photos of inanimate objects on black backgrounds. His other work includes The Elements, Molecules, Reactions, How Things Work and Engines. In his other life, he designs and makes specialized note-taking fieldwork equipment and he works in the quality control department for a large automotive company. He lives in Urbana, Illinois.