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TIL thousands of people of Jewish decent were conscripted or volunteered into the German army during WWII, some ending up in senior positions. Hitler personally signed off on the "declaration of German blood" for 77 high-ranking officers who had Jewish parents or were married to Jews.

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pYyMQ TIL that Haff Disease is unexplained rhabdomyolysis (muscle breakdown) within 24 hours of eating fish. The cause is thought to be an unidentified poison.
JY8rj TIL: That during the design process of the World Trade Center, engineers had considered and done an analysis of a scenario where a jet airliner impacted a tower.
5YNbR TIL of viruses that attack bacteria called ‘bacteriophages'. The term phage originates from Greek phagein, which translates as ‘to eat'. A single phage injects its genome into a bacterial cell, switching the cells' program in its favor. The host cell eventually dies, releasing about 100 new phages.
BkBy TIL when John Glenn flew above Perth, Australia in 1962 aboard Friendship 7, the city’s homes, cars, and streetlights were lit for him. When Glenn returned to space aboard STS-95 in 1998, Perth repeated their act of friendship.
OXBL TIL that Brett Favre played for so long in the NFL that he began publicly talking about retiring in 2002, nine years before officially doing so in 2011. Favre, who entered the league in 1991, became the only active player with a grandchild in 2010.