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TIL of Frantisek Zahradka. He was arrested in 1949 in Czechoslovakia when he was in high school for assisting people to cross the border. He spent two years in solitary, and 18 years was forced to mine uranium ore for the government.

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GYrlN TIL the oldest known written complaint is from ancient Babylon written c. 1750 BC. In it, a customer named Nanni complains to the merchant Ea-Nasir about the low quality of his copper as well as him being rude to Nanni's servent who had to pass through enemy territory only to be refused a refund.
nWXxo TIL the BIPM doesn't use a physical rod that's exactly 1 metre similar to the physical "Kilogram" specimen, instead use concise measurement of light & time defined in 1984 by the CGPM as the distance light travels, in a vacuum, in 1/299,792,458 secs with time measured by a cesium-133 atomic clock.
eppd4 TIL ‘Operation bodyguard’ was used in WW2, a combination of inflatable tanks, phoney insignias, fake radio transmissions, dummy paratroopers and even feeding faulty information to mislead spies. These efforts helped delude Germany into believing Calais would be the site of the D-day landings.
78GwL TIL of Euthyphro dilemma, found in Plato's dialogue Euthyphro, in which Socrates asks Euthyphro, "Is the pious loved by the gods because it is pious, or is it pious because it is loved by the gods?" "The gods" refer to the Greek pantheon.
awrJ9 TIL that Durex released a service called SOS condom, where condoms would get delivered to houses in 2 hours. It launched in Dubai, but the government banned it in a week. They ran an internet poll to vote on where it would be next, but trolls voted for the city “Batman” and won, and it was canned.