What If? Serious Scientific Answers to Absurd Hypothetical Questions

XKCD in book form! Hilarious all the way through. Monroe takes questions that anyone could have asked and goes into them in extreme detail. If getting to the answer to a question doesn't prove to have a funny conclusion, Monroe continues upping the ante until things get interesting. I'd say it's a combination of Mythbusters and a comic – which is basically XKCD anyways. So what kind of questions? What would happen if the moon went away? If we hooked turbines to people exercising in gyms, how much power could we produce?