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TIL of HEXAGON, a spy satellite used by the USA during the 1960s that captured several miles of film at a time, airdropping them into the ocean for recovery

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d8pPd TIL that in the 50s and 60s, American chiropractors held a series of rather unusual beauty pageants where contestants were judged and winners picked not only by their apparent beauty and poise, but also their standing posture (backed with X-rays of their spines, of course).
a7gy TIL that the first man to wear a top hat was arrested for causing women to faint and creating a riot that ended up breaking a young boy’s arm.
X0DPX TIL that there is a shoe exchange for amputees so they don't get stuck paying for 2 shoes all the time
78kJX TIL that in 1919 the Austrian state of Vorarlberg held a referendum where 80% voted to join Switzerland. Switzerland refused though as they didn't want another German/Catholic Canton to upset the delicate balance between them.
loEw7 TIL Researchers have created a bio-inspired compound eye that is helping scientists understand how insects sense an object and its trajectory with such speed. The compound eye could also be useful for 3D location systems for robots, self-driving cars and unmanned aerial vehicles.