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TIL that after poachers kill large mammals the presence of vultures overhead can warn rangers that a kill happened. So the poachers poison the carcasses for the vultures. This is causing a large decline in the vulture populations and leading to increased levels of disease.

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jNZ7n TIL of Hermann Grassmann, an untrained Prussian mathematician who created linear algebra (the central tool of quantum mechanics) 65 years before it found it's use in QM. For most of his life he was considered a crackpot but received an honourary PhD shortly before he died.
QxKe TIL That Theodore Roosevelt’s son, Theodore Roosevelt Jr, was the only General involved in the initial assault on D-Day, after insisting to his superiors that he be one of the first ones off the boats. He survived the battle but died of a heart attack one month later.
b98Q4 TIL a 64 year old Finnish skier hit 125 mph at the Albertville Olympics in 1992. 38 years prior he finished 11th in the Combined event (downhill and slalom) at the 1956 Olympics at Cortina.
XAd8 TIL that in 2008 in Afghanistan, a British Marine threw his back on a grenade and lived, and also saved lives of his patrol. His rucksack took the impact, and he was awarded with the Victoria Cross, the highest British military honor. He only suffered a nosebleed and a shock in the aftermath.
Bl9b TIL that, in order to communicate with the Shoshone tribe, Lewis and Clark would speak English to Corps member Francois Labiche, who would speak French to the interpreter Toussaint Charbonneau, who would speak Hidatsa to his Shoshone wife Sacagawea, who would speak Shoshone to Chief Cameahwait.