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TIL During sleep, brain waves help flush waste out of the brain. Individual nerve cells coordinate to produce rhythmic waves that propel fluid through dense brain tissue, washing the tissue in the process

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via reddit.com

4DX TIL Alec Guinness, who played Obi-Wan in the original trilogy, told a child to “never watch it again” after the fan boasted about seeing the movie over a hundred times, as he hated the part of Obi-Wan.
lLW1 TIL Clint Eastwood once ran for mayor of a small town in California. Part of his campaign platform was overturning a ban on ice cream parlors. He won.
BrVdk TIL of Rick Rescorla, a security consultant for Morgan Stanley who anticipated the 9/11 attacks and implemented practice emergency evacuations every 3 months. During the attacks he managed to evacuate most of the 2,687 employees and died trying to help even more people out of the buildings.
VMnD0 TIL Mark Spitz, a 9 time Olympic Champion jokingly told the Russian swim team coach in 1972 that his moustach increased his speed in the water, deflecting water away from his mouth. The next year, every Russian swimmer was sporting one.
E1eAV TIL Talking to yourself in the third person - a technique known as illeism - can improve your decision making and emotional stability