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TIL that the crew of Mr. Rogers' Neighborhood rarely talked to Fred off set and made fun of him behind his back. Despite this, when the same men would sneak into the studio before shows when Fred was rehearsing with the puppets, in order to ask his puppets for advice, he still gave them advice.

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gMwwA TIL there’s a protein made by placenta cells called syncytin which aids in the attachment of the placenta to the uterine wall, making it essential for nutrients to get to the developing fetus. The gene that codes for the protein actually came from a virus millions of years ago.
b9WdZ TIL that in the US, higher obesity rates are significantly correlated with lower income only among White women and children. Among men, higher obesity rates are actually associated with higher income, especially Black and Mexican-American men
R5Bd8 TIL media tycoon Kerry Packer once paid off a cocktail waitress' $130,000 mortage after he accidentally bumped into her, causing her to spill her drinks. Another time, he paid off a cocktail waitress' $150,000 mortage as a tip for good service.
e01x4 TIL Mary Ball Washington, George Washington's mother, was orphaned at 12 and named her son after her guardian, George Eskridge. Her husband, Augustine Washington, died when their son George was 11, and she never remarried. She died of breast cancer in 1789, after George became the president.
E14xp TIL A very tired chemist once spilled UK's entire supply of plutonium(10mg) on a table, and in order to recover it, used a saw to cut out that section of the table, then burned it. He recovered 9.5mg of the plutonium from the ashes.