What if?

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Randall Munroe left NASA in 2005 to start up his popular site xkcd.com, 'a web comic of romance, sarcasm, math and language' which offers a witty take on the world of science and g eeks. In pursuit of answers to the strange questions fans ask, he runs computer simulations, pores over stacks of declassified military research memos, solves differential equations and consults with nuclear reactor operators. Here, he explains the laws of science in operation in a way that every intelligent reader will enjoy and feel much the smarter for having read. Show more