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TIL former professional athlete Bo Jackson frequently refers to himself in the third person, a habit he developed as a child due to his severe stutter which made it difficult for him to say "I"

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5YJAD TIL about tetrachromats. Tetrachromats have 4 vision cones as opposed to the average 3. This allows them to see ~99 million more shades than the average person. It is thought to be impossible for men to have this gene because they only have a single X chromosome, whereas women have two.
8pAZ TIL that in the 2:58 mark of Hey Jude, you can hear “fucking hell” as Paul McCartney makes a mistake on the piano. The band thought it was too funny to take out.
x7pB TIL: Steve Buscemi was a New York City fire fighter from 1980 to 1984. After the events of 9/11, he showed up in NYC to volunteer, working twelve-hour shifts for a week, and digging through rubble with his old comrades looking for missing firefighters
mpYO TIL… Night Pearls are a rare form of Fluorite that is naturally luminescent, almost as tough as diamonds, and feature prominently in Chinese legends.
PybV TIL of math prodigy George Green, who operated a windmill for 20 years. Almost completely self-taught, he could not attend university until almost 40 years old. Green nonetheless graduated from Cambridge as one of the top math students; Einstein later said that he was 20 years ahead of his time.