Isaac Asimov's Foundation Trilogy is one of the high-water marks of science fiction. It pioneered many of the familiar themes of modern SF, and the sheer sweep of his "future history" shaped many if not most of the writers who followed him. With the permission -- and blessing -- of the Asimov estate, three of today's bestselling SF writers, Gregory Benford, Greg Bear and David Brin, have conspired (like the original Foundation ) to complete the...