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TIL , as a congressman, future 20th President James A. Garfield contributed to the Pythagorean Theorem by providing additional proof using a trapezoid.

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eRO6 TIL that a British company made a laptop with a graphical user interface, a 60 hour battery life, SSD storage, and a touchpad. In 1989.
BrkdL TIL in 1965, the Pope and the Orthodox Patriarch of Constantinople lifted a reciprocal excommunication that had been in place since 1054
Jw88 TIL that pistachios can spontaneously combust if packed in bulk.
woXm7 TIL of the Brumadinho Tailings dam (toxic sludge created as a byproduct of Iron mining) collapse, the company that owned this mine owned another mine where they had another Tailings dam collapse causing major loss of life.
ADeB4 TIL: The mother of Dmitri Mendeleev (creator of the Periodic Table) traveled 1200 miles with her son to a university in Moscow to plead for her son's admission, only to get rejected. The mother then rode with Mendeleev another 400 miles to Saint Petersburg University and got him admission.