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TIL that masers (laser-like directed energy weapons using microwave radiation instead of visible light) actually predate lasers by several years, and in fact some of the earliest lasers were even referred to as "optical masers"

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Odk7 TIL Korean writing system, despite looking complicated, consists of only 24 basic letters and can be learned in just one day
lOP1 TIL that Espresso Book Machine, a print on demand machine developed to print, collate and bind a paperback book in a couple of minutes. Since its debut at the New York Public Library in 2007, the machine is now in 70 bookstores and libraries in the world.
MrbW TIL - A 17 Year Old Girl Was Sentenced to ‘Life in Prison Without Parole’ for the Murder of Her Pimp
XEMeR TIL Marlon Brando was only 47 years old when he starred in The Godfather (1972). It required meticulous make-up work by Dick Smith to transform him into the elderly patriarch Vito Corleone.
awwjL TIL there are individuals actively advocating against cochlear implant surgery. They consider the possibility of curing deafness a form of "ethnic" genocide as such an event would lead to the destruction of a unique population of people with a linguistic culture onto themselves.