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TIL that during WWII the British submarine HMS Trident had a reindeer doe onboard named Pollyanna. An unexpected gift from the Soviet Union, Pollyanna reportedly adapted well to life onboard, ate several maps, and eventually survived the war to live out the rest of her life in a British zoo.

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wLRV1 TIL At age 24, George Ellery Hale revolutionized solar observations with his invention of the spectroheliograph, making it possible to photograph the sun's prominences in full daylight. A spectroheliograph can tune-in to gases such as hydrogen and calcium, and photograph specific solar details
OgOe TIL that twin brothers separated at birth and reunited 39 yrs later lived almost parallel lives. Both were named James, both owned a dog named Toy, both had married twice; first to women named Linda and second to women named Betty. Both drove Chevys, smoked Salem cigarettes and drank Miller Lite.
nMYo TIL that Epicurus is a renowned, Ancient Greek philosopher who believed that friends were the greatest source of everlasting pleasure to an individual. He lived on a simple diet of bread & water, focusing on rational pleasures.
v1KM4 TIL Demetri Martin, while studying at Yale submitted a 224 word palindromic poem for a fractal geometry course project.
J15B TIL that a Soviet NKVD executioner personally killed 7000 Polish officers over a 28 day period with a pistol, working 10 hours per night and averaging a person every three minutes. He personally accounted for almost one third of the Katyn Massacre.