While waiting for your flight to board, you look at your phone and realize its battery is at 1 percent. You look around but can’t find a power outlet. There might be practical solutions to this problem. Or, you could follow Randall Munroe’s instructions and attach a paddle wheel to an escalator in order to power a…
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Why xkcd Creator Randall Munroe Wrote the World’s Most Extreme ‘How To’ Book
