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TIL about the Tetris effect, in which people who play Tetris for extended periods of time start seeing falling tetris blocks in their sleep as well as regularly identifying tetromino shapes in their everyday life, such as the layout of boxes on supermarket shelves or patterns on certain buildings.

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MB80 TIL that, by law, no US officer is ever allowed to outrank George Washington, and he was posthumously promoted to “six star general” to make sure.
k644 TIL The world’s largest maze is on the Dole pineapple plantation in Hawaii.
4Xy56 TIL Seagulls (and some other birds) stand on one leg as it reduces body heat lost by non-feathered parts of their body by 50%.
p8jlQ TIL only about 4 percent of people have "outie" bellybuttons as adults. Surgeons now offer umbilicoplasty procedures to change the bellybutton's appearance and to turn outies into innies.
R7Vg1 TIL that in 1971, a US man named Gerald Mayo filed a lawsuit in the District Court of Pennsylvania. He was suing Satan, for making him fall down. The judge rejected "Mayo v Satan", pointing out that Mayo did not provide appropriate directions for the US Marshals to serve the summons to Satan.