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TIL that the last complete radio silence in the world happened for two minutes after the death of Gugliemo Marconi on July 21, 1937. To this day, no complete radio silence has been record.

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BgMbb TIL that Hawaii was a sovereign self-governing kingdom all the way up until 1893, totally unassociated with the U.S., until a coup d'état that year by 13 businessmen and 162 U.S. troops, with the openly stated goal of annexing the islands. (They succeeded.)
XLpk TIL: You burn 650 calories donating one pint of blood.
GYK14 TIL that the depictions of the mafia in The Sopranos were so accurate, that real members thought that they were being spied on. These conversations were overheard, when the FBI were indeed spying on them.
8QdG TIL that YouTube “freezes” the view count at 301 when videos start getting lots of views. The real numbers are posted once all the traffic to the video is verified as genuine.
JwpB TIL the album cover of Joy Division’s “Unknown Pleasures” is a visual representation of the first ever extraterrestrial pulsar discovered by humans.