A collection of Randall Munroe's answers to "what if" questions submitted to his website. Munroe is the cartoonist who makes the xkcd cartoon and a former NASA roboticist. Included are the answers to "What would be the outcome of a magnitude 15 earthquake?" and "If you suddenly began rising at 1 foot per second, how exactly would you die?". The author's works have a pleasant nerd-like/adolescent/whimsical quality, plus you can learn some physics, and the meaning of the word apricity. The hardbound book from Houghton Mifflin Harcourt is unusually well-designed and printed.