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Charles Darwin believed the reason the human menstrual cycle is the same length as the lunar cycle is because humans evolved on the seashore and needed to be in sync with lunar tides.

Nov 9, 2022•1 min read

Fun Fact: Charles Darwin believed the reason the human menstrual cycle is the same length as the lunar cycle is because humans evolved on the seashore and needed to be in sync with lunar tides.

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sciencefocus.com

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