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TIL former UN Secretary General Kurt Waldheim's voice was used to record the longest audio greeting to extraterrestrials on the Voyager Spacecraft; approx. 7 years after the spacecraft was launched, Waldheim was publicly accused of participating in war crimes by famed "Nazi Hunter" Eli Rosenbaum

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wLLwM TIL that Madame Tussaud made wax death masks of those executed in the French Revolution including Marie Antoinette. She had been readied for the guillotine herself before being pardoned to make the death masks.
mxb4Y TIL Planthoppers (Issus coleoptratus) has the only mechanical gears ever found in Nature. The first natural design that mechanically functions like our geared systems contrasting the gear-like structures previously found on other animals like the spiny turtle which were purely ornamental.
Nk7M TIL that Mongolians were the first to discover yogurt; after riding on horses with milk stored in animal bladders, the milk was curled by the natural enzymes inside of the bladders.
7J0Z TIL “Boko Haram” means “Western education is forbidden” in English. Mohammed Yusuf, the group’s first leader, has stated that he does not believe that the Earth is a sphere, nor does he believe that evaporation causes rain.
GYbb7 TIL nuclear physicist Nicholas Kemmer suggested the atomic symbol "Pu" for plutonium deliberately as a joke because it resembled "P.U." (an expression of disgust at a foul smell), yet no one objected, and it made it onto the periodic table.