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TIL the 2006 Ig Nobel Peace Prize was awarded for "The Mosquito" which is a machine used to deter loitering by emitting a high-frequency sound. Some versions are intentionally tuned to be heard primarily by younger people. The sound was also made into a ringtone that couldn't be heard by teachers.

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RBa7 TIL that the Nazi salute looked almost identical to what was, at the time, the salute to the American flag. The USA changed the salute in 1942 after the Nazis adopted it.
nW7MB TIL the Star Wars planet Tatooine was named after an extant Tunisian city named Tataouine
BYvK TIL that when male lions are neutered they don’t grow a mane or lose the mane.
1mlV TIL Yao Ming was a chemically engineered propaganda experiment that went well.
XBER TIL that the ratification of the 19th amendment, which guaranteed women the right to vote, came down to the vote of one 24-year-old Tennessee representative who, at the last minute, decided to vote in favor of the amendment due to a note his mother had written asking him to change his vote