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TIL that the old euphemism for a positive pregnancy test, "the rabbit died", came from a test developed in 1931 wherein the urine from a human female was injected into a rabbit. Soon after, the rabbit was euthanized and dissected to check for the reaction of the hormone hCG in its ovaries.

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rNRGx TIL that when the film adaptation of the Crow was in preproduction, Paramount studio execs proposed turning the movie into a musical starring Michael Jackson.
0QNL TIL There was a conventional bombing raid that surpassed both Hiroshima and Nagasaki. The U.S. used 1700 tons of incendiary bombs to light a giant flaming X in the most populated part of Tokyo. The death toll is unknown, but it destroyed homes of over a million people, killing at least 100,000.
DQBGj TIL that the inspiration behind Professor Snape in Harry Potter was a chemistry teacher John Nettleship. Nettleship at first was upset about this attribution, but later came to embrace it, even writing a book.
YrdP TIL “Mary” of Mary Had A Little Lamb was an 83-year-old teacher named Mary F. Sawyer, who brought her pet lamb to the school she taught at around the time of the Battle of Waterloo
5VD8p TIL woolly mammoths were still alive while the Great Pyramids were being built.