John D. Barrow is Professor of Mathematical Sciences and Director of the Millennium Mathematics Project at Cambridge University, Fellow of Clare Hall, Cambridge, a Fellow of the Royal Society, and formerly Professor of both Geometry and Astronomy at Gresham College, London. His previous books include The Book of Nothing, The Constants of Nature, The Infinite Book, Cosmic Imagery, the bestselling 100 Essential Things You Didn't Know You Didn't Know, The Book of Universes, and, most recently, 100 Essential Things You Didn't Know You Didn't Know About Sport.