DAVID DARLING, Ph.D., is the author of several other narrative science titles, including Equations of Eternity, a New York Times Notable Book, and Deep Time. He is also the author of The Universal Book of Mathematics, The Universal Book of Astronomy, and The Complete Book of Spaceflight, all from Wiley, as well as more than thirty children's books. His articles and reviews have appeared in Astronomy, Omni, Penthouse, New Scientist, the New York Times, and the Guardian, among others. He lives near Dundee, Scotland.