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TIL it is beneficial to lick your wounds. A variety of compounds in human saliva actually do speed healing.

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Y71Kv TIL that key aircraft controls are required to be shape coded - the flap handle is shaped like an airfoil, the propeller condition levers have ridged knobs, the thrust levers are smooth and cylindrical, and the landing gear handle is shaped like a wheel
epgJE TIL about Randy Gardner, who set the world record by staying awake for 11 days and 25 minutes in 1964 as part of a high school science experiment, experiencing severe cognitive and physical effects but fully recovering afterward.
VB5V0 TIL Mariah Carey gave birth to her twins while listening to her own song, a live performance of 'Fantasy'
XVoX TIL The human appendix is no longer considered a vestigial (useless) organ. It plays an important role in your immune and lymphatic systems.
jKnM TIL in 1896 Auburn ROTC cadets greased the skids of a railway track before a football game. The train with the incoming team couldn’t stop and slid halfway to the next town, forcing them to walk 5 miles to the game and possibly contributing to their 45-0 loss.