"What if?" It's one of mankind's favorite questions. What would happen in certain circumstances that may or may not be ridiculous?
In this book, What If? Serious Scientific Answers to Absurd Hypothetical Questions, Randall Munroe, creator of the highly popular webcomic xkcd, decided to answer some silly "what if" questions... with not-so-silly answers. He uses very real - sometimes very complex - mathematical and scientific concepts to answer questions like, "What if you pitched a baseball at the speed of light?" and "What if you started floating into the sky at a steady one meter per second?"
The answers may be serious and well-reasoned, but that doesn't mean they aren't funny. Munroe's smart and witty humor is ever-present, along with his trademark stick-figure illustrations.
If you appreciate Munroe's writing, you might also want to check out xkcd: Volume Zero.