TIL about the frog test, a common form of pregnancy test until the 1960s. Urine would be injected subcutaneously into the dorsal lymph sac of the frog. If the woman was pregnant, the frog would start ovulating around 12 hours later, due to a hormone in the women’s urine.

Read more: https://en.wikipedia.org/wiki/Frog_test?wprov=sfla1

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