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TIL Hippos can't really swim, but instead walk or sometimes run on the riverbed

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via reddit.com

ZYjB TIL of a man who survived the fire and sinking of a ship in 1871, leaving him emotionally scarred. 41 years later, he was finally able to overcome his fears and nightmares, deciding to sail again… only to die in the sinking of that new ship: The Titanic.
ANwLn TIL: There is an official world record for time travel. It is held by cosmonaut Sergei Krikalev, who has spent a total of 803 days in orbit around the Earth. According to Einstein's relativity theory, Sergei has traveled approximately 0.02 seconds forward in time.
9wlAQ TIL there's a medical condition that causes its sufferers to sweat blood.
78p8b TIL there was a cold snap called the Great Blue Norther on 11/11/1911 where many Midwestern cities recorded record high and low temperatures within a two day span. There were also at least a dozen tornadoes.
4XNXw TIL that the original iphone prototypes were so secretive that the engineers had their own OS called the 'skankphone' only a few engineers got to see the real OS and worked together debugging code through a curtain.