Why do men have nipples? That strange bodily question has baffled so many that it even has become the title of a book by Mark Leyner and Billy Goldberg. Interestingly, solving this puzzle has more to do with understanding your embryonic development than your evolutionary past.

Click the link below and watch the video above to get to know your nipples. And don't forgot to sound off in the comments section below. Come on, talk nerdy to me!

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