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TIL that Polish intelligence officer Witold Pilecki volunteered for a resistance operation to be imprisoned in Auschwitz in order to gather intelligence about the camp. He organized a resistance movement in the camp, sent information to the Allies about what was happening there, and escaped in 1943.

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bDPp TIL the 1883 eruption on Krakatoa produced the loudest sound ever known it reverberated around the globe 7 times before diminishing. It could be heard 4,000 miles away, and people with in 100 miles had permanent hearing loss.
rRBE0 TIL that Pipe Organs need to be tuned like almost every other instrument, a long and laborious process made more complicated by the fact that the body heat of the organ tuner is sufficient to noticeably change the pitch of the pipe.
wLv98 TIL: In 2014, in the game EVE Online, a massive battle was fought over territory which ended up causing losses of $330,000 actual dollars because of the destruction of players' ships. EVE Online's currency is tied to actual dollar values and the losses for individual ships could cost up to $4,000.
vP4N8 TIL, in the year 2003, Maywood Chemical Works — now owned by Stepan Company — imported more than 385,000 pounds of coca leaf for Coca-Cola, enough to make $200 million of cocaine, all of which legally had to be destroyed, likely by incineration.
69VXQ TIL The national flag of Nepal is the world's only non-rectangular flag. The flag is a simplified combination of two single pennons (or pennants), known as a double-pennon.