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TIL in South Korea, spinning “barber poles” outside an establishment signify a brothel not a barbershop

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e07pn TIL Half of the world's prison population of about nine million is held in the US, China or Russia.
JKAk TIL that when group of freed slaves kneeled before him, Lincoln responded “Don’t kneel to me. You must kneel only to God, and thank him for your freedom. Liberty is your birthright. God gave it to you as he gave it to others, and it is a sin that you have been deprived of it for so many years.”
nek5B TIL of a man named Frank Amodeo who had a plan to become emperor of the world. He owned several private security firms employing 40,000 people, met with Bush in the white-house and regularly worked with intelligence agencies world wide. He was busted for tax fraud and he is currently in prison.
1rW8 TIL Fracture Putty is a material being developed that when packed in & around a bone fracture, provides full load bearing strength within days. It would create an osteoconductive bone-like structure that degrades into harmless resorbable byproducts as normal bone heals.
Br6yr TIL a race condition bug in the Therac-25 (a radiation therapy machine) caused some patients to receive radiation doses "that were hundreds of times greater than normal". The bug arose after technicians became 'to efficient' at entering commands causing code to execute in an unintended order.