Myth, tradition, and biology once pointed to a link between menstruation and the Moon — and new evidence supports it. But since 2010, artificial light has begun to break that connection.

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Early embryonic hearts are the first functioning organ in embryos, playing a critical role in development, but don’t resemble the mature four-chambered organ we might imagine. Some anti-abortion legislation hinges on the term ‘fetal heartbeat’ to describe early cardiac activity when neither a fetus nor a chambered heart exist.

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