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TIL that during WW2, Wilhelm Canaris, head of the German military intelligence, actively sabotaged Hitler's plans during the entire war. Canaris was caught and executed near the end of the war, in april 1945.

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XEmxk TIL That Snoopy is NASA's official safety mascot. Every astronaut since 1968 has worn a silver Snoopy pin into space; upon return, the astronauts present the pin as a special recognition to a civilian team member who helped keep them safe.
vPYRB TIL the Hellfire Club is a real place in Ireland and was believed to have been a Freemasons meeting point.
KOQv4 TIL The Trafalgar Square Christmas tree is a Christmas tree donated to the people of Britain by the city of Oslo, Norway each year since 1947 as a token of gratitude for British support to Norway during WWII.
lorWa TIL about the Fast Inverse Square Root, an ingenious set of code that quickly calculated accurate square roots in Quake 3 using floating points and Newton's method. However, it is not exactly known who on the dev team implemented the code.
x6Qxo TIL Shipoopi was a real song and not just a creation of Seth McFarland for Family Guy.