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TIL NASA pioneered research for Postural Orthostatic Tachycardia Syndrome (POTS)/Orthostatic Intolerance (OI) and developed therapeutic exercise programs for them for astronauts returning from space.

Read more ntrs.nasa.gov

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GVK1 TIL Nikola Tesla planned to secretly experiment on children, lining the walls of schoolrooms with high-voltage lines, believing that exposing them to the energy would make them healthier and smarter, and he believed every home in the future would soon do likewise.
neVdW TIL Ray Bradbury took 9 days to write his novella, The Firemen, in the basement of a UCLA library on a typewriter rented for 10¢/30 minutes. After being urged by his publisher, he returned to the basement, got to work, and expanded his novella into Fahrenheit 451, which also took 9 days to write
04nR TIL in 1906 Mark Twain, lonely and missing his wife and daughters, formed a club of young girls called the Angelfish Club who met regularly at his house to play cards.
GYe71 TIL that although Balto is famously accredited for the 1925 Alaskan serum run, it was actually another Siberian Husky named Togo that lead the most perilous leg of the relay. Togo ran over 300 miles while the other relay sled teams, including Balto, averaged around 31 miles.
PY9xw TIL J.K. Rowling thought the casting of Hermione, Ron, and Harry was perfect except for one thing. The actors were too good looking for their geeky characters.