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TIL the first time Led Zeppelin licensed one of its songs for commercial use was giving the song "Rock And Roll" to Cadillac for a television commercial. The band earned a "ridiculous" fee for this but Cadillac saw sales increase by 16% the following year.

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rDyy TIL about the Integral Fast Reactor, a nuclear reactor that is fully sealed and will not require refueling until the end of plant life. It is also meltdown-proof, and can reuse its fuel many times by reprocessing fuel using robotic arms sealed with the reactor. None exist today because of politics.
yQkKw TIL Wi-Fi at 5GHz is faster, but has a shorter range. Wi-Fi at 2.4GHz covers a farther range, but is slower.
KOerw TIL that in 1921, Evan O'Neill Kane was the first doctor to remove his own appendix to test if local anesthetic would be sufficient pain killer for patients.
e0nmn TIL that in Peru in 2007, a meteorite impact caused a "mystery illness" that turned out to be widespread arsenic poisoning from the meteorite evaporating contaminated groundwater
Y4bG TIL that actor Kevin Spacey has become an unofficial mascot for the Florida Panthers NHL team and has been spotted at games wearing a mask of himself