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The original was posted on /r/todayilearned by /u/Amelia20006 on 2024-05-30 04:51:10+00:00.

Original Title: TIL about the “Rabbit Test,” a human pregnancy test created in 1931. It involved injecting urine from a woman into a female rabbit. If the rabbit’s ovaries showed enlargement upon dissection, it indicated the woman was likely pregnant, with about a 98% certainty. This was utilized until the 1970s.