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TIL from the 1930s to 1960s pregnancy tests worked by injecting a mouse or rabbit with the woman's urine. The animal was then dissected, and if the ovaries were enlarged it indicated the woman was pregnant.

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kWyB TIL Following the release of Rocky IV, a joke was making rounds in Hollywood. Since Rocky had run out of opponents, he would have to fight an alien if a fifth movie was made. Jim and John Thomas took the joke seriously and wrote a screenplay based on it, which later became the movie “Predator”.
5YwDn TIL Industry, California is a city in California with only 219 residents, but over 3,000 businesses and 67,000 workers.
6EDKJ TIL that the game Geometry Dash used to be called, "Geometry Jump beta."
NX0pb TIL that the largest spider in the world, the Goliath Bird Eater, is edible and has been described as “shrimp-like”
ebWg TIL that when the first phone book was published in 1878, it was just a list of people who owned telephones, with no numbers provided