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TIL about Francis Henning, who made upwards of half a million counterfeit nickels. Called: Henning Nickels, many were later recovered, melted down, and made into actual nickels by the US Mint. Despite remaining illegal to own, they are a numismatic collector's item, some being relatively valuable.

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0wQY5 TIL When the first steam engine was built in 1804, people were worried that the speed would make rail passengers unable to breathe or that they would be shaken unconscious by the vibrations
7rx8p TIL that the Mantis Shrimp has one of the best eyesights in the animal kingdom. It’s hexnocular vision is so powerful that it sees six images at once, sees in 12 colors, and can polarize its own light. Scientists are now modeling its capabilities to detect cancer and internal injuries in humans.
dDM97 TIL that during the Battle of the North Cape the cruiser HMS Belfast pursued the battleship Scharnhorst away from the first engagement, risking Scharnhost's guns in order to keep a radar track to guide a second British fleet into position to sink her
pYwwb TIL in the wake of the Mississippi Burning murders, the FBI, having no leads or informants, enlisted the help of mafia enforcer Gregory Scarpa. His kidnap and 'interrogation' of a local suspect provided the information the DOJ needed to prosecute within days.
EgKBd TIL that there has been over 20 spelling errors made on the Stanley Cup. Some errors were corrected or covered up with the letter ‘X’, while other errors still remain.