Maxwell's Demons..They reverse entropy. They create order out of chaos. They do not exist..or do they? A collection of science fiction and science fact by Ben Bova. Bova's Demons are: An amnesiac time traveller who must stop an avenging alien from the future bent on the total destruction of the human race; A future White House candidate who pleases all of the people all of the time. Is this simply his mastery of the media..or is there more to him than that?; An engineer who dreams of the ultimate transport--the supersonic zeppelin. But who's gonna pay for the SSZ?