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TIL that cancer in heart cells is extremely rare, or unlikely to occur due to the cell division mechanism in a heart's muscle cells

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5YZBR TIL that the first black woman to travel to space was Mae Jemison, who was a mission specialist on the Space Shuttle Endeavor in 1992. She later appeared on "Star Trek: The Next Generation", making her the first person to have been on Star Trek and in space IRL.
ZK6D TIL The Korea Central Zoo in North Korea is home to a Parrot than can squawk ‘Long live the Great Leader, Comrade Kim Il-sung’ in English
VM6gk TIL, In 1887, a group of men added a name Susanna M Salter to the mayoral ballot of Argonia, Kansas, as a joke intended to humiliate women. Instead, she won over 60% of the votes and became America's first female mayor.
b6Wja TIL about vitrification of nuclear waste, wherein nuclear waste is melted down and combined with molten glass. The mixture is cooled in stainless steel canisters where it becomes a solid and can be stored or buried indefinitely with no risk of leakage or contamination to the environment.
ney0P TIL in 1998, Mariah Carey wanted to buy a penthouse in NYC but needed approval by the city's board. During the interview, one of the board members asked her if “Mr. Biggie” (recently murdered) would be visiting the building. She responded “Mr. Biggie, he be dead.” She was denied the penthouse.