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TIL that as NASA’s Jupiter-bound Juno spacecraft swung past Earth on Oct. 9, 2013, amateur radio operators around the world sent a Morse Code “HI” to the spacecraft, and Juno heard them!

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bmD0 TIL ThePirateBay plans to host their servers in orbit from space using “GPS-controlled drones and far-reaching cheap radio equipment”
dYX9 TIL During WWII American prisoners under German control had a mortality rate of about 1%. American POW’s under Japanese control had a mortality rate of about 37%
NXELQ TIL The Carpenters 1970 signature smash hit song We've Only Just Begun was originally performed by its lyricist Paul Williams (The Rainbow Connection) for a bank's TV commercial.
Z8OAa TIL Sergei Rachmaninoff's greatest hit is 1975's "All By Myself," in which Eric Carmen unknowingly included copyright protected melody structure from Rachmaninoff's 2nd Piano Concerto, thinking it was public domain. It wasn't, having been originally published in 1901.
ADjmB TIL that a sheepherder in Wyoming built a cabin out of dinosaur bones he found on the ground, not knowing that’s what they were until a paleontologist stumbled upon the place in 1897.