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TIL: The first-ever solar-powered satellite, Vanguard 1, is "the oldest human-made object still in orbit" (plus some of its launch rocket). Launched in 1958, it stopped talking in 1964 but continues orbiting. The three sats older than it (Sputniks 1 & 2, Explorer 1) are no longer in orbit.

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M70BA TIL the Brooklyn bridge originally was called the New York and Brooklyn bridge
OGkP7 TIL Mexican Republican Dollars were once the dominant currency in Shanghai
e0xng TIL that some experts theorize John F. Kennedy might not have lived out his term, even if he hadn't been assassinated. He suffered from Addison's disease, and would have likely been bedridden or dead by 1965 or 1966.
ObZ1 TIL of the Uru people, who live on 42 artificial floating islands made of reeds in Lake Titicaca.
9rDr TIL that in 1945, Eisenhower predicted that people would try to deny the holocaust, and had multiple pictures taken of the Nazi crimes to hinder any such attempts.