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TIL that in the 1930s, the first pregnancy tests were done through injecting a woman’s urine into an infantile mouse, which would then be dissected so its ovaries can be inspected. If the woman was pregnant, the mouse would show signs of ovulation.

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mMMo TIL of the “Coffee Cantata”, a comic opera by J.S. Bach about a young woman who drank absurd amounts of coffee to annoy her father, who wouldn’t let her marry
gr6gD TIL moss grows in sloths' fur, and there's a moth species that only lives in sloth fur moss. Sloths make risky descents to defecate rather than defecating from the canopy so moths which lay eggs in their dung and make their moss more nutritious can live in their moss.
dDDNZ TIL the first indoor mall in the US was opened in 1955 in Wisconsin
b9Ko0 TIL the remains of a species of whale that was unidentified for 30yrs was found to be a narwhal-beluga whale hybrid with features of both. While a narwhal is toothless except males who have a spiraled tusk and belugas have 40 teeth the hybrid has 18 and some look similar to a narwhals spiraled tusk
Jgmm TIL In 2009 Burger King launched a campaign that if you unfriended 10 friends on Facebook you were entitled to a free whopper. The ex-friend would receive a message explaining that their friendship was less valuable than a whopper.