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TIL: In 1926, Tesla accurately predicted smartphones. "A man will be able to carry one in his vest pocket."

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1OoO TIL Mohammed Hemly, an Egyptian doctor who lived in Nazi Berlin, saved the lives of a Jewish friend and her family by sheltering them in his cabin for 3 years. Years later the Isreali Government gave him an honorific title, but his next of kin rejected the honor, citing Egypt-Israel relations.
P18aV TIL that the Colt Armalite AR-15 was used in Vietnam starting in 1961. Battlefield reports from US Army Special Forces lavishly praised the AR-15 and the stopping-power of the 5.56mm cartridge, pressing for wide adoption as a replacement for the M-14. The M-16 variant was then deployed in 1964.
R5gZQ TIL the peregrine falcon is the fastest animal in the world and can go as fast as 300 km (186 miles) per hour using their dive technique
awL0b TIL A prequel to the film Gladiator entered development in 2001, and is still in development as of 2019
yV8P8 TIL that Platypuses glow under UV light