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TIL on 21 September 1956, a F-11 effectively shot itself down after firing a burst 20mm cannons while traveling supersonic speeds and running into it's own bullets.

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R7N6w TIL that a marathon is exactly 26 miles and 385 yards because that happened to be the length of the 1908 London Olympic marathon and not because it is the distance between Marathon and Athens, which is approximately 25 miles.
VBK4D TIL in the 1940s and 50s, a vast labyrinth of subterranean tunnels were dug into the frozen permafrost underneath Novy Port in Siberia for cold storage. It's been called the world’s largest natural refrigerator. The tunnels run for more than a kilometer and has some 200 small side tunnels and caves.
56Jp TIL British Matinee Idol Dirk Bogarde was painting in France when he realised the field in which he had set up was littered with children’s skulls. They turned out to have died in a WW2 bombing raid he himself had ordered years earlier.
18jd TIL that April 1st was originally celebrated as the New Year day, until in 1582 Pope Gregory XIII ordered a new calender to replace the old one. Those who continued celebrating the New Year on April 1st (either rebels or ignorant of the new changes) were thus branded ‘Fools’.
ANLDw TIL in 2020, it was announced that AlphaFold, a neural network based on DeepMind AI, can predict a protein's final shape based solely on its amino-acid chain with an accuracy of 90%. Predicting the structure of a polypeptide from its sequence is considered of the greatest challenges in biology.