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TIL that in 1876, James Garfield, future 20th President of the United States, developed a proof of the Pythagorean Theorem that was published in New-England Journal of Education.

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nWKPd TIL that since the 1920s, excessive pumping of groundwater at thousands of wells in California's San Joaquin Valley has caused land in sections of the valley to sink by as much as 28 feet (8.5 meters)
QQZ9 TIL of Cunningham’s Law: “The best way to get the right answer on the Internet is not to ask a question, it’s to post the wrong answer.”
aw48M TIL that singer Helen Kane sued Fleischer Studios for basing Betty Boop's singing style on her and demanded royalties. She lost because Fleischer lawyers proved that Kane stole the style from African American singer Esther Jones.
4Xpvg TIL that shinrin-yoku (meaning "forest bathing") is considered a form of nature therapy in Japan which has positive effects on mental and nervous wellbeing. It consists essentially in taking long walks in forests.
l7jL5 TIL when people are asked to pick a “random number between 1 and 100,” the most common answer is 37