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TIL Sherlock Holmes was inspired by a real person, Doyle based the character of Sherlock Holmes at least in part on Dr. Joseph Bell, a surgeon and professor at Edinburgh’s Royal College of Surgeons.

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dDkpZ TIL that the African American Heritage Flag, created in 1967, represents the black experience in the United States. The wreath represents peace and prosperity, the blunted sword is a symbol of pride and knowledge, and the colors stand for blood shed for dignity and "pride in our pigmentation".
NZo8 TIL Muhammad ratified a document giving Christians freedom to practice their faith without interference from Muslims.
Qyk9 TIL that Houston airport received many complaints about baggage wait times. In response, they moved baggage claim further away so the walk was longer than the wait. The number of complaints dropped.
D100J TIL: Sucking a King's nipples was an ancient Irish form of submission. Cutting off a royal descendant's nipples made him ineligible for kingship.
6EVZZ TIL that Japan aims to power the Tokyo Olympics with 100% renewable energy. They plan to use wind & solar energy to power the stadiums & athletes village. They also want to recycle the small amounts of gold, silver & copper from around 80,000 old phones by using the metals to create 5,000 medals.