The world's most entertaining and useless self-help guide, from the brilliant mind behind the wildly popular webcomic xkcd and the million-selling What If? and Thing Explainer . For any task you might want to do, there's a right way, a wrong way and a way so monumentally bad that no one would ever try it. How To is a guide to the third kind of approach. It's full of highly impractical advice for everything from landing a plane to digging a hole. Best-selling author and cartoonist Randall Munroe explains how to predict the weather by analysing the pixels of your Facebook photos. He teaches you how to tell if you're a baby boomer or a millennial by measuring the radioactivity of your teeth. He offers tips for taking a selfie with a telescope, crossing a river by boiling it and getting to your appointments on time by destroying the moon. By exploring the most complicated ways to do simple tasks, Munroe doesn't just make things difficult for himself and his listeners. As he did so brilliantly in What If? , he invites us to explore the most absurd reaches of the possible.