A special 10th anniversary edition of the million-copy bestseller What If? from the creator of the wildly popular webcomic xkcd-revised and annotated with brand-new illustrations and answers to the most absurd hypothetical questions you never thought to ask.Fans of xkcd ask Munroe a lot of strange questions: What if you tried to hit a baseball pitched at 90 percent the speed of light? How fast can you hit a speed bump while driving and live? If there was a robot apocalypse, how long would humanity last? What if everyone only had one soulmate? What would happen if the moon went away?In pursuit of answers for these wild thought experiments, Munroe runs computer simulations, pores over stacks of declassified military research memos, solves differential equations, and consults with nuclear reactor operators. His responses are masterpieces of clarity and hilarity, complemented by his signature xkcd comics. (They often predict the complete annihilation of humankind, or at least a really...

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