From the creator of the wildly popular webcomic xkcd, hilarious and informative answers to important questions you probably never thought to ask. Millions of people visit xkcd.com each week to read Randall Munroe’s iconic webcomic. His stick-figure drawings about science, technology, language, and love have a large and passionate following. 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? In pursuit of answers, 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 signature xkcd comics. They often predict the complete annihilation of humankind, or at least a really big explosion. The book features new and never-before-answered questions, along with updated and expanded versions of the most popular answers from the xkcd website. What If? will be required reading for xkcd fans and anyone who loves to ponder the hypothetical.

本书是前NASA员工、超热门科普漫画“xkcd”作家兰德尔•门罗的新作，内容来自他的“What If”科学问答专栏，辅以“xkcd”经典火柴人漫画，轻松幽默地将各学科知识跃然纸上。 如果人体内的DNA瞬间消失了会怎样？如果把海水抽干会怎样？如果地球膨胀得像太阳一样大会怎样？牛排从多高的地方掉下来正好烤熟？全人类搬离地球需要几步？这不是中规中矩的《十万个为什么》，而是脑洞大开的科学真相，小时候萌生的异想天开，都可以在这本书里找到最机智幽默的科学答案！