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Why do women have two nipples and two breasts?

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He estimated that around one in 500 humans, or 0.2%, have "supernumerary nipples" – that is, a number of nipples greater than two. There are almost as many guesses as .... A case reported in 1827 refers to a French woman who had a complete third breast on her left thigh. read more

Two reasons come to mind: * Humans and other large mammals tend to be symmetrical. Other than say the digestive tract and the heart, it seems like everything else occurs in pairs -- kidneys, two halves of a brain, two arms and legs. read more

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