/u/Basilikon's posts in /r/askscience

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Darwin believed the human menstruation cycle was the same length as the Lunar phase because it was for some reason adaptive for early coastal humans to deal with tides. Does modern biology proffer an explanation why those periods are identical in length, or is it simply a coincidence of fact?

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Darwin believed the human menstruation cycle was the same length as the Lunar phase because it was for some reason adaptive for early coastal humans to deal with tides. Does modern biology proffer an explanation why those periods are identical in length, or is it simply a coincidence of fact?	1