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Always Good To Have A Spare
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Here's a rather detailed explanation of how people get extra nipples. I'm not sure I fully understand, but I know it's not a throwback to earlier stages of evolution and I think it has something to do with how fetuses develop and mammary ridges that develop and recede and in some babies, the ridge doesn't recede and you get a third nipple or even an extra breast, and I'll let you go all "Total Recall" on that. (BBC)
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