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What If
By Randall MunroeWhat would happen if you had a mole of moles? Or if everybody on planet Earth decided to jump up and down at the same time? How high up would you have to drop a steak for it to be cooked by the time it hit the ground? Former NASA scientist Randall Munroe has been amusing the internet with his stick figure drawings since 2005, mostly on the popular website xkcd.com, but the popular comics website is also home to a column where he answers hypothetical (and very often insane) questions about physics, space, chemistry and just about everything else.