Menstrual synchrony

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Notion

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Science and technology

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What Wikipedia says

The menstrual synchrony theory of psychologist Martha McClintock proposes that living together would tend to synchronize the menstrual cycles of women.

Excerpt from the Wikipedia article “Menstrual synchrony”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Altg20April2nd, CC BY-SA 3.0, via Wikimedia Commons.