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TIL of the Olympic Salute. Formerly a tradition at the events, it consisted of the right arm being raised at an angle. At the 1936 Olympics in Berlin, many interpreted athletes doing the salute as supporting the Nazi government due to its similarity to the Nazi salute. It was retired after WWII.

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KYGEB TIL about Dan Rather, a journalist, saved thousands of lives during Hurricane Carla in 1961. He created the first radar weather report, which helped initiate the evacuation of 350,000 people.
8vjV TIL Of ‘Project Thor’: a terrifying weapon system that is shockingly simple - 6 m. Tungsten rods launched from near Earth orbit, invisible to radar, could strike anywhere on earth, impact speed of Mach 10, impact equal to a tactical nuclear bomb but with no explosives.
kVXe TIL there was a psychopharmacologist Alexander Shulgin that had a schedule I license from the government to create and personally test over 230 psychoactive drugs
7r1Jp TIL that in February 1335, two Oxford University students complained to the bartender of the Swindlestock Tavern about the quality of wine served. The argument turned into a brawl which escalated into a riot that lasted over three days, killing around 30 townsfolk and 63 members of the university
LQ0OP TIL from 1976 to 1989 an unknown taping noise was audible worldwide on commercial and civilian communications (tv broadcast, commercial aviation, SW radio). The source was the Duga radar "The Russian Woodpecker" a huge over-the-horizon radar used by the Soviets as a missile detection system.