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TIL Quaternary Twins are when two babies are both cousins and genetically siblings. This happens when two identical sisters have children with two identical brothers.

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dDxa8 TIL about Shahrazad, a real (albeit banned in tournament play) Magic the Gathering card that requires the players to immediately begin a sub-game of Magic with the results impacting the original game
wLQYE TIL that in 2018 a 4-year-old Pennsylvania boy was summoned for jury duty. He explained he had preschool that day and so could not serve.
W7Q1A TIL that in 2001, a US navy submarine performed an emergency ballast blow maneuver to impress civilians onboard. It surfaced at high speed directly under a Japanese ship and cut it in half, killing 9 on board.
wL7NJ TIL of Otokichi, a Japanese sailor who was shipwrecked and drifted to the Pacific Northwest in 1834. He stayed with the native Makah tribe before the local British agent sent him to London. He then moved to Macao and worked for the British, only returning to Japan twice more (once in disguise).
yX6p TIL that astronauts must sleep next to air vents. The CO2 they exhale in their sleep will not dissipate in zero gravity, meaning they will suffocate if there is no immediate circulation.