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TIL the Sword in the Stone story was inspired by a real sword stuck in a stone. It was placed there miraculously by the first officially canonized saint in the Catholic Church in the 12th c. It’s still in the stone in a church in Italy.

Ka6B TIL a Greenland shark was tagged off Greenland in 1936 and recaptured in 1952. Its measurements suggest that Greenland sharks grow at a rate of 0.5–1 cm (0.2–0.4 in) per year, thus the largest individuals may live about 200 years, making them among the longest-lived vertebrates on Earth.
ANDRd TIL: "Guerilla Ontology" is a term coined by Robert Anton Wilson. Its purpose is to expose a dogmatic individual to radically unique ideas, thoughts and words. As a consequence, that person will experience cognitive dissonance and have their beliefs about reality challenged.
BgVyL TIL that Weird Al Yankovic's "White and Nerdy" was so popular that despite the original song "Ridin" winning a Grammy, people would go up to Chamillionaire and say that they heard his version of Weird Al's song
5Yl98 TIL in 1901, the Wright brothers built their own wind tunnel out of wood, old hacksaw blades and bicycle spokes; using it to test more than 200 wing shapes hand made from pieces of sheet steel and wax. The data it generated was critical to their first powered flight two years later.
OGeA6 TIL that in 1993 Todd Rundgren released the first interactive album, No World Order, for the Philips CD-i (under the name TR-i). The disc allowed listeners to listen to six different versions of the album from guest producers and make their own mix.