Isaac Asimov's Wonderful Worlds of Science Fiction, No. 6: Neanderthals

(from back of book) From a child snatched out of a distant past to a prehistoric spaceship crash to a man who can cast his mind back in time, here are twelve provocative tales of the "different branch" of humankind Neanderthals. So journey now back along that path not taken, and learn the many possible fates of our forgotten cousins, traveling their own, secret ways through-