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TIL the first artificial insemination took place in 1884 when a med professor injected his unconscious patient with the semen of “his most handsome student”, unbeknownst to both the woman and her infertile husband.

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bjlN TIL it would only take ~12 GB to download all ~5,000,000 articles from Wikipedia.
D1dp TIL that although botox is commonly used to reduce wrinkles, it is also the most toxic substance known to man, a spoonful of the protein has the potential to kill 1.2 billion people.
4kDeg TIL that Barry O'Brien who wrote for Filmation's Pinocchio and the Emperor of the Night movie went on to write Hannah Montana decades later...
wod9o TIL: The San Francisco subway system still runs on 5 1/4-inch floppies
Wkvnd TIL the QWERTY keyboard layout probably allowed early typewriter salesmen to impress their customers by being able to easily type out the example word "typewriter" without having learned the full keyboard layout, because "typewriter" can be spelled purely on the top row of the keyboard.