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TIL that King Arthur had a Muslim knight: Sir Palamedes. In Arthurian Legends, he is famed for being part of the Tristan-Isolde-Palamedes love triangle, the hunt for the Questing Beast, and the search for the Holy Grail (wherein he converts to Christianity).

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78wAx TIL on 3 December 1894, the author of Treasure Island Robert Louis Stevenson was talking to his wife and straining to open a bottle of wine when he suddenly exclaimed, "What's that?", then asked his wife, "Does my face look strange?", and collapsed and died a few hours later due to a stroke.
e0JxD TIL that the mousetrap is the "most frequently invented device in American history". The American Patent and Trademark Office has issued a total 4400 mousetrap patents, and 400 applications are still made yearly. Only 20 of these inventions have been commercially successful.
ypDV TIL in the 19th century Human Zoos (zoos that displayed humans) were quite popular. The last one was closed in 1958; oddly, the first person to ban them was Hitler.
78olM TIL the "Adoption" episode of "You Can't Do That On Television" (which is the TV show that introduced green slime on Nickelodeon) was so controversial that it was banned in the U.S. The co-creator of the show later stated that the writers were unaware of the sensitive nature of the subject.
R7JPa TIL Viagra is given to some premature babies to increase oxygen transport by widening the blood vessels, as their lungs often haven't developed enough to transport oxygen efficiently on their own