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TIL modern science can turn other elements into gold (in microscopic amounts)

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epM1b TIL Sarah Josepha Hale, the author of "Mary Had a Little Lamb," campaigned for decades to make Thanksgiving a national holiday, writing to five presidents. Lincoln finally agreed in 1863.
kJVDE TIL that Palazzo Senatorio, the city hall of Rome (Italy), has been the the seat of the Municipality of Rome since 1144, making it the oldest town hall in the world
j4kp TIL that Mark Haub, a professor at Kansas State University, went on a “convenience store” diet which mainly consisted of Twinkies, Oreos, and Doritos to demonstrate that counting calories is what matters most in weight loss, not the nutritional value in food. He lost 27 pounds in only two months.
kJ6Xd TIL that Happy Days producers intentionally sought a short actor to play Fonzie. They didn't want his character to overshadow the rest of the cast who were all under 6 feet tall.Despite their intent, Henry Winkler (5' 6") still became the breakout star.
Pw1Z TIL there are only eight extant species of bear in the world.