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TIL that Leonardo da Vinci designed a robotic knight operated by cables. When modern engineers built a replica based on the designs, it was functional.

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WkMW9 TIL Tipping became popular in the US during the decades following the Civil War, when some US employers began encouraging their customers to tip, thereby avoiding paying African-American employees a decent wage
NXMKE TIL of Kopi luwak coffee / civet coffee. A highly priced coffee from Indonesia brewed from coffee beans that are eaten, digested and defecated by an Asian palm civet
xX75 TIL Many mammals have a bone in their penis which helps them stay hard during sex.
rO7M TIL the two 3000 year old bog people they found in Scotland were actually “Frankenstein” bodies made from six different skeletons
VMkm4 TIL that Nobuo Fujita, the Japanese pilot who attacked a town in Oregon during World War II returned years later to present his family's 400-year-old samurai sword to the city as a symbol of regret