time

"Time: A Traveler's Guide" by Clifford Pickover. Now, here's an interesting book - it's all about time. Is time travel possible? Is time real? Does time flow in one direction only? Does it have a beginning and end? Various arcane subjects are discussed: space-time diagrams, light cones, cosmic moment lines, transcendent infinite speeds, Lorentz transformation, superluminal and ultraluminal motion, Minkowskian space-times, Godel universes, closed time-like curves, and Tipler cylinders. Now, I admit I don't understand most of that, but I'm reading it for fun :)