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TIL the East German Stasi used psych warfare called Zersetzung against dissidents. Tactics involved breaking into homes and subtly manipulating the contents; moving furniture, altering alarms, removing pictures from walls. Many thought they were losing their minds, and had mental breakdowns.

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9YAoD TIL that Pink Floyd's The Wall is implied to be an endless loop. The final song, Outside the Wall, ends with the words "Isn't this where...", and the album begins with the words "... we came in?" with a continuation of the melody of the last song, hinting at the cyclical nature of Water's theme.
P1p4w TIL that a professional wrestling pay-per-view event jointly produced by Japan and the United States was held in Pyongyang, North Korea in 1995. It was called "Collision in Korea", and holds the record for the largest attendance of a pro wrestling event in history
16ewW TIL Brian Wilson was deaf in his right ear, and thus mixed the Beach Boys' albums in mono because that was the only way he could hear them.
negGr TIL about the SMS Emden, a small German cruiser in the first world war that raided shipping in the Indian Ocean. in late 1914 she sailed over 35k miles around the Ocean, sinking a total of 71k tons of shipping. (more in comments)
grDW7 TIL: Venice was built upon millions off wood piles that were driven into the muds and saltwater of a swamp area. The salt water caused them so solidify and not rot away. Then they were built upon with wood, mud, venetian bricks, and more to create a city with the natural protection of water.