In Maxwell's Demon: Why Warmth Disperses and Time Passes, physics professor Hans Christian von Baeyer tells the story of heat through the lives of the scientists who discovered it, most notably James Clerk Maxwell, whose demonic invention has bedeviled generations of physics students with its light-fingered attempts to flout the laws of thermodynamics. An intelligent, submicroscopic gremlin who could sort atoms as they flew at him, Maxwell's Demon would effectively make an impossible task - forcing heat to flow backward - possible. Explaining why the Demon can't have his day has been an intellectual gauntlet taken up by a century and a half of the world's most brilliant scientists, whose discoveries Professor von Baeyer vividly etches. The centuries-old discipline of thermodynamics informs today's most cutting-edge research in chaos, complexity, and the grand unified theory of everything - physics' Holy Grail. Even more amazing, the study of heat turns out to explain something seemingly unrelated - time, and why it can run in only one direction.