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TIL that the two ethnic groups, the Hutus and the Tutsis, in the Rwandan Genocide were designated by European colonists somewhat arbitrarily. A Hutu could become a Tutsi by acquiring ten cows.

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VM8OZ TIL While Governor of New York Franklin D Roosevelt went to such lengths to hide his reliance on a wheelchair that he had a secret elevator and entrance into his office in the state capital building.
4Xlko TIL that constantly day dreaming and using it to distract from the real world is an actual mental illness called maladaptive daydreaming.
nevl7 TIL Sleep literally cleans your brain. During slumber, more cerebrospinal fluid flushes through the brain to wash away harmful proteins and toxins that build up during the day.
NRm8 TIL a soldier posted on Peleliu in 1944 craved ice-cream so much that together with aircraft engineers put a can filled with milk onto the underside of each wing tip of their planes, attaching a stirring shaft to a wind-driven propeller and then taking off. They made 100 portions of ice every day.
d8dw7 TIL the breakup of Yugoslavia was arguably accelerated by a Serbian man who was injured while pleasuring himself with a glass bottle. When questioned by doctors, he blamed his injury on an attack by "Albanian separatists" and became a cause celebre for Serbian ultranationalists.