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TIL PFC Sadeo Munemori was posthumously awarded the Medal of Honor for diving on a live grenade. He was the only Japanese American decorated during or immediately after WWII.

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WrVA TIL that people with one arm are exempt from switchblade laws.
xVlPw TIL in the 1960s the United States designed a practical plasma weapon for a space battleship
j6pPj TIL the SCRAM button on nuclear reactors is an acronym for Single Control Rod Axe Man, which initially was just a guy who'd cut a rope to drop in the boron control rods in an emergency
OQge TIL our fingers and toes prune in water because of a response mechanism in our nervous system that has evolved to give us a better grip on wet or submerged objects.
bW84 TIL McDonald’s in 2008 saved $278,850,000 by removing one of the two slices of cheese from the McDouble/Double cheeseburger.