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Perhaps you’ve heard the saying, “Everyone has a twin somewhere in the world.” Not a biological twin (although some people do have one or more of those) but a person who bears an uncanny resemblance to an unrelated stranger. English speakers call these kinds of twins “look-alikes.” In German the term is doppelgĂ€nger (literally, “double goer”). DoppelgĂ€ngers are common in literature, horror movies, and folklore. But how common are they in real life? The answer...