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TIL when there's less solar radiation, temperatures on Earth go up. This is because there's less solar magnetic shielding against cosmic rays, so radioactive carbon-14 in the atmosphere goes up. Evidence of this is trees contained more carbon-14 during the last Medieval Warm Period.

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yQ8oV TIL Ernest Hemingway had often complained the FBI was tracking him, but was dismissed by friends and family as paranoid. Years after his death released FBI files showed he had been on heavy surveillance, with the FBI following him and bugging his phones for nearly the final 20 years of his life
M7J5B TIL the loud thumping air pressure changes in a moving car when a single window is rolled down is called Helmholtz Resonance. This also occurs when air is blown into the mouth of an empty bottle.
yjMl TIL scientists have found 1.5-billion-year-old water in a mine 1.5 miles beneath Ontario, Canada
8aQba TIL Dolphins sleep by resting one side of the brain at a time. This allows them to continue rising to the surface for air and to keep an eye open to watch out for predators.
BrNpd TIL the first time Jimi Hendrix jammed with Cream, Eric Clapton was found back stage furiously puffing on a cigarette and said: “You never told me he was THAT fucking good"