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TIL: Oscar the Grouch was orange for the first season of Sesame Street (1969), and has been green ever since the second season (1970)

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gMMkb Despite its gusty reputation as a "gas giant," Jupiter's blood-red clouds hide a dense, rocky core that's perhaps 20 times as massive as Earth.
AD1Go TIL that self-sustaining nuclear chain reactions can occurre and already have occured in nature.
dJG7 TIL that it takes over two minutes to pour a pint of Guinness, if you follow the recommendations from the brewery.
pDKO TIL there is a clock being made to tick for 10,000 years and play different melodies every time the bells chime.
YNwW TIL the 18th century religious group called the Shakers have only 2 remaining members. Unrelated fact, a core belief is that all members practice life long celibacy.