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TIL that in English-speaking countries and Europe it's professional for cab passengers to sit in the back seat, while in many Latin American countries, it's more professional to sit in the front seat, with the added benefit of making the ride look like a friendly favor, reducing the risk of robbery

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neg99 TIL during the Cold War, the US built Camp Century, in Greenland - a supposed research facility under the Arctic ice that was actually part of a project to install nuclear missile sites. It was abandoned and environmental hazards including waste from its nuclear reactor are now under the ice.
OowV1 TIL in 1960, Fidel Castro nationalized all U.S.-owned businesses in Cuba. The US sent CIA trained Cuban exiles to overthrow him, but failed due to missed military strikes. Castro captured the exiles, but ultimately freed them in exchange for medical supplies and baby food worth $53M.
b6lNa TIL the bars on exit doors were coined "crash bars" due to the way people crashed into them to escape during emergencies. Before these devices were invented, people were often crushed to death as they tried to escape through doors that wouldn't easily open.
LkJ6v TIL in 19th-Century America, popcorn was eaten with milk and sweetener as a breakfast cereal.
GAmr5 TIL Vibrators were first developed as a medical device. In the late 19th century, vibrators were marketed and used as medical devices, specifically for treating conditions like female ‘hysteria’ and pelvic congestion.