Menstruation: The Aftermath of an All-Natural But Ruthless Embryo Screening

By Diane Kelly on Throb, shared by Ria Misra to Gizmodo

Most animals don’t menstruate. If they don’t use their uterine lining, they simply reabsorb it. Only bats, monkeys, and apes take the drastic and seemingly-wasteful step of pitching out the entire thing. And humans toss it out more often than any other animal.

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