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TIL Octopus have 9 brains, 3 lungs and blue blood. Each of its 8 arms has one mini-brain, and one central brain. The blue blood is because the protein, haemocyanin, which carries oxygen around the octopus's body, contains copper rather than iron...

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kONvd TIL Georgy Zhukov, Marshal of the Soviet Union, was an avid fisherman in his retirement. When President Eisenhower, who considered him the most instrumental Allied leader in Hitler's defeat, learned this he had him sent a set of fishing tackle. Zhukov used it exclusively, for the rest of his life.
4kOmw TIL in 1800’s New York City, pigs roamed freely and ate trash in the streets. When city government attempted to ban them in 1821, pig owners refused and rioted, causing the government to suspend their efforts. Over the next 28 years, owners continued to riot anytime the city tried to ban pigs.
GYkD4 TIL that dozens of women sent Ted Kaczynski (the Unabomber) provocative letters. He fell in love with a fourth-grade teacher, who he forged a "deep connection" with. Music he composed was played at her funeral, and he called her his "Lady Love".
lo4e7 TIL that because Peru's Machu Picchu is in a hidden location, invisible from below, the Spanish conquistadors never came across the site, and thus were not able to destroy it. Local communities knew about it, but because the Spanish had a reputation of destroying temples, they did not speak of it.
v1K67 TIL Christopher Nolan planted 500 acres of cornfields just for 'Interstellar' to save money and even made profit by selling produced corn.