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TIL that mitochondria and chloroplasts were originally separate prokaryotic organisms (single celled organisms) engulfed by eukaryotic cells (plant and animal). Now they are part of our DNA due to a continued endosymbiotic relationship.

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16gK8 TIL, in 1998 it took several days to bring down a rogue 25-story tall Canadian weather balloon even after two F-16s fired more than 1,000 rounds of cannon shells into it. The balloon had severe impact on trans-Atlantic air traffic as airliners were forced to divert from their projected flight paths
p8PGO TIL The Portia Hypothesis is a scientific theory that claims that women with masculine sounding names, do better in male dominated fields such as law and engineering, than women with feminine names. It is named after a female Shakespeare character who dresses up as a male lawyer and wins a trial.
l7n8K TIL that in 1962 there was a bill proposed to change the name of Philippines to Malaysia but the then newly independent neighbouring country took the name before the bill was passed.
rNdko TIL that Groucho Marx had several “last words” before his death. Some had thought it was “either I’m dead or my watch has stopped,” whilst others believed it to be “die, my dear? why that’s the last thing I’ll do!” His actual last words were “this is no way to live.”
JY4Nv TIL In '72 Billy Joel got into a legal battle with his label and was forbidden from recording. He moved to LA and played at a bar under an assumed name to earn money. This was the inspiration for the song "Piano Man". All the characters in the song were based on real people Joel had met at the bar.