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TIL that there is a battery-powered bell that was set up in 1840 and has run nearly continuously ever since. It holds the Guinness World Record as "the world's most durable battery delivering ceaseless tintinnabulation (a ringing or tinkling sound).

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grOWW TIL ear wax production can increase with stress or fear.
e0MPJ TIL there is a town in Canada named Asbestos
woJ9M TIL pentagrams have been found on Sumerian pottery dating back to 3500 BCE
GApKG TIL about Project Venona, the US effort to decrypt KGB/GRU intercepts leading to some of the greatest intelligence breakthroughs during the cold war. Including exposing critical Soviet assets, (ie. the Rosenbergs, David Greenglass, and Kim Philby)
GkM1 TIL in 1970, Hunter S. Thompson ran for sheriff of Aspen against an conservative, ex-military Republican incumbent. Thompson shaved his head totally bald, so he could refer to the competing party, who was sporting a close-cropped crewcut, as ‘my longhaired opponent’ in speeches and interviews.