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TIL that in 1993, scientist Cesare Emiliani proposed switching the Gregorian calendar to the Holocene calendar which would account for the entirety of human civilization, starting 12,000 years ago at Year 0. Making the current year 12021 HE (Human Era).

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R7P14 TIL in 72, after Led Zeppelin had released 4 platinum albums, a festival mgr. wrote manager Peter Grant requesting a booking of "Led Zeppelin and his backing group." Grant replied by taking out a full page ad in a music industry publication in the form of a letter captioned, "Mr. Zeppelin regrets."
v1Nwr TIL at Live Aid Bono noticed that a girl was being suffocated in the crowd, tried to get security to help her out, but when they didn’t understand what he meant, he jumped off the stage and helped security pull her out. She later said that Bono saved her life that day.
OoepX TIL of Laynes Law in which every debate is over the definition of a word.
mx6Ey TIL When Al Kaplon lost his job as a minor league umpire, he took his talents to Hollywood and has been an umpire or referee on movies and TV like "American Gladiators", "The X-Flies", and "Dodgeball: A True Underdog Story". He's even been an umpire for a Viagra ad.
neaLP TIL A dagger discovered in King Tutankhamen’s tomb, in 1925, was made of meteoric metal. It wasn’t until recently that scientists were able to confirm, using portable X-ray fluorescence spectrometry, that it was composed of iron, nickel, and cobalt, “strongly suggests an extraterrestrial origin.”