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TIL some radar detectors use radar detector detector detectors to detect radar detector detectors to prevent detection

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gMpND TIL in 1998, a married couple was left behind during a diving trip to the Great Barrier Reef. Two days passed before anyone realized what had happened. Despite a 5-day search, the couple was never found. A dive slate was later recovered which read "... rescue us before we die..."
RQR6 TIL Victorinox, the maker of the iconic Swiss Army knife, lost over 40% of its business after 9/11. The company refused to lay off any employees.
xVd4B TIL Dennis Wilson was the only member of The Beach Boys who actually surfed. He drowned at age 39.
PkjE TIL that cicada song is loud enough to cause permanent hearing loss in humans should the cicada sing just outside the listener’s ear. Males disable their own tympana while calling, thereby preventing damage to their hearing.
wLkY TIL the N64 game Conker’s Bad Fur Day only sold 55,000 copies