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TIL about Abigail and Brittany, a pair of conjoined twins who have lived remarkably regular lives; each girl has total control of one arm and they coordinate movement through unexplainable processes, demonstrating a deep connection despite having their own brains and spines.

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b6nJ4 TIL about “paper streets” that exist on maps, but were either planned and not constructed, or can be deliberately included in published maps as trap streets, forming a copyright trap.
789wx TIL that an early application of the "Buddy System" was used to prevent trench foot in WWI. Rather than each soldier being responsible for just their own feet, they and their assigned buddy were jointly responsible. Trench foot rates dropped significantly with this innovation.
JYaQj TIL that in 1992, Sega orchestrated the world's first global launch of a video game, Sonic the Hedgehog 2. They chose a Tuesday and dubbed the event "Sonic 2sday". At the time, new games would release at different stores on different days. Thanks to Sega, Tuesday is now the industry standard.
9Y10m TIL about Chad Pregracke, who,when he was 23, after witnessing immense levels of trash on the Mississippi River in IL, started a nonprofit to address it. Since then, they have removed 5,000 tons of trash from the Mississippi and it’s tributaries.
k0J5 TIL that space dust tastes like raspberries because they both contain the compound ethyl formate.