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TIL Albrecht von Wallenstein was the most successful Catholic general of the 30 years war, upon realizing the war was futile and could last decades he tried to organize peace only to be assassinated by his emperor. He was proven right with the war lasting another 14 years and 6 million more dead

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VmyZ TIL That in World War I, the Germans tried to use a picture of Quentin Roosevelt’s body as propoganda to increase moral. This backfired, as soldiers wondered why the sons of American Presidents were fighting and dying at the front, while the Kaiser’s sons were not.
M7LBm TIL while laying underwater cable in the Chicago river a diver discovered a 40ft submarine. Inside he found the remains of a human and a dog. Their identity is still a mystery more than a century later.
M68a TIL the color of the glass in a sprinkler system is indicitave of the temperature at which it will activate - orange being the lowest at 135 degrees and black being the highest at up to 625 degrees
rNBaW TIL that octopuses have three hearts. Two of these hearts pump blood to the gills, while the third pumps it to the rest of the body. When an octopus swims, the heart that delivers blood to the body actually stops beating, which explains why they prefer crawling to swimming—it’s less tiring for them!
AD4Lg TIL that the Nazi Germany Parliament was derisively referred to by Germans as the "the most expensive singing club in Germany", since it couldn't do much other than sing the National Anthem during its sessions.