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TIL of Marni Nixon, a singer who dubbed the voices of many actresses in the 1950’s and 1960’s, including Natalie Wood, Audrey Hepburn and Deborah Kerr. She was told that if anyone found out about her work, she would never work in Hollywood again…

XpED TIL: There is a lake in the country of Palau where jellyfish evolved without stingers after the lake’s connection to the sea closed, leaving them isolated from their natural predators. These ‘Golden’ jellyfish are totally harmless to humans and you can swim with them.
MeZPB TIL Hurricanes do not generally have thunder nor lightning - thunder and lightning are formed by vertical winds that cause water and ice to rub together, and most hurricane winds are horizontal
16Wxd TIL that both successful and unsuccessful attempts at humor increase perceived confidence, but only successful attempts also increase perceived competence and social status
loMKr TIL we call people with red hair "red heads" as opposed to "orange heads" because the phrase has been around longer than the colour orange. The colour orange was described as red up until the 1500's when the first reference of orange in the English language can be found.
owg8 TIL that Nikola Tesla used to feed pigeons, bringing injured ones into his hotel room to nurse back to health and one time spending over $2,000 to fix a pigeon’s broken wing and leg, including building a device that comfortably supported her, so her bones could heal.