The universe of the mind is a limitless expanse of wonders, filled with worlds and secrets that cannot be fully explored within the pages of a single novel. Avid readers of science fiction have long appreciated the myriad joys of returning to fictional galaxies already experienced; delighting in the ever-unfolding mysteres of Frank Herbert's Dune or Asimov's Foundation series, for example. In Far Horizons--edited by acclaimed author Robert Silverberg--...