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TIL Euler's often wrote the earliest written reference on a given matter. In an effort to avoid naming everything after Euler, some discoveries and theorems are attributed to the first person to have proved them after Euler.

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XOeD TIL that Niel Bohrs once told Albert Einstein to “Stop telling God what to do” in reply to Einstein’s famous quote “God does not play dice.”
yQlRw TIL In 1891, Tesla made a risky Demonstration to discredit Edison company's claims on Safety of AC.During the Demo, For a moment, 250,000 volts raced across the surface of his body , causing him to be surrounded by what one newspaper called “the Effulgent Glory of Myriad Tongues of Electric Flame.”
P1Mn TIL Enigma (German WWII encryption) was broken in part because operators used guessable passcodes, including letter repeats, adjacent key letters, four letter German names, and obscenities.
AJwg TIL: Syphillis destroyed so much of Al Capone’s brain, his doc and psychiatrist put Capone’s capabilities as being a 12-year old.
ADWx TIL- Leif Ericson discover North America 500 years before Columbus using Iceland Spar, a stone that refracts light in 2 visible wavelengths, enabling him to find the sun on cloudy days.