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TIL Men were the first to wear high heels around the 1600s. Women began wearing them to look more masculine.

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GYwNQ TIL the US military is developing a plane capable of Mach 6 (4,600 mph) to succeed the now-retired SR-71 Blackbird, which flew at Mach 2.8. This new plane, the SR-72, is unmanned, will perform surveillance and reconnaisance, and a protoype will fly in 2025 before entering service in 2030.
4Xxpg TIL of the Tea-Horse-Road. During Imperial-era, the Chinese noticed that Tibetans prized tea so much, they would trade high-quality horses for tea-bricks. As they needed warhorses to fight nomads, the Chinese set up a government office to sell tea for Tibetan horses, creating the Tea-Horse Road.
KYZR6 TIL Amazon Japan first introduced Black Friday in 2019 by giving discounts on black-colored items
8yB4 TIL that the SNL Jeopardy sketch was created by Norm Macdonald purely so that he could show off his Burt Reynolds impression.
GAZ4g TIL the camera used on the original Apollo moon landing missions didn't have a viewfinder