Two of science fiction's brightest stars team up to re-create a classic tale of what happens when past and present collide. Asimov's story The Ugly Little Boy, first published in 1958, told of a 21st-century time-travel experiment in which a Neanderthal child is plucked out of time and transferred 40,000 years into the future. Now Asimov and Silverberg have expanded on the original tale.