Hippos navigate by it, sloths keep in touch through it, dung beetles eat it . . . and most grown-ups would rather not to mention it. Meanwhile, scientists who study animal feces find out all sorts of things, such as how many insects a bat eats or just what method a T. rex used to devour a triceratops 70 million years ago. However you look at it, poop is the quintessential prototype for recycling and practically the most useful stuff on earth. Take a peek at POOP, the mini edition, and find out all you need to know — what it’s for, where it goes, and how much we can learn from it.
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