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TIL ice blocks are cut from frozen lakes, packed in sawdust and sold and delivered door to door before the invention of refrigerators

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jVYp TIL that Students at John Hopkins University collaboratively decided to opt out of their final since the professor set his curve based on the highest score grading it as 100%. They chose to receive a score of zero making it the highest grade, thereby getting 100%
BYMd TIL when Eagle of Apollo 11 was landing on the moon, the automated landing program tried to land in boulder filled West Crater. Neil Armstrong quickly switched to manual control, landing safely on a flat surface. Upon landing, the Eagle only 30 seconds of fuel remaining.
kkGE TIL that many Scientists believe killing off mosquitoes would have little negative consequences.
VaVG TIL that US Government agencies (CIA, FBI, Naval Intelligence) have recruited the American Mafia multiple times in order to reach their goals. A couple examples are defending the New York harbor during WWII and attempts at assassinating Fidel Castro in the 1960’s.
1Z7D TIL: There are 5 authentic versions of the Gettysburg Address, and we don’t know for sure which one Lincoln actually delivered at Gettysburg.