Robert J. Sawyer -- bestselling author of Calculating God and Hominids -- has won both the Hugo and Nebula Awards for Best Novel of the Year. Here, with his first-ever collection of stories, he proves he's equally adept at shorter lengths. The tales gathered in Iterations have been nominated for the Hugo and Bram Stoker Awards, and have won the Aurora Award the Crime Writers of Canada's Arthur Ellis Award, and France's top SF award, Le Grand Prix de l'Imaginaire. Each story is prefaced by Sawyer's account of its genesis, and the collection as a whole is introduced by acclaimed science-fiction writer James Alan Gardner. In Iterations, you'll find out what really happened to the bones of Peking Man, discover the fact of physics that makes the pope abdicate, see Sherlock Holmes solve the greatest puzzle in modern science, transfer consciousness into a Tyrannosaurus rex, and visit the surface of a Dyson sphere.