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TIL of the Gaia Hypothesis, which states that Earth should be categorised as a single pre-life organism operating on chemical reactions, much like an amoeba.

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ADxLw TIL of Planet Nine - A hypothetical, 10x Earth-sized planet within our solar system that orbits around the sun every 15k years. This hypothesis is currently supported by Jim Green, director of NASA's Science Mission Directorate and professor Tom Levenson of MIT.
1a07O TIL, when Paul Reuter developed his own news agency (Reuters News Agency) he used carrier pigeons to give Berlin news from the Paris stock exchange, as they were speedier than trains.
BrxVd TIL Tibbles the cat was personally responsible for the extinction of the Stephens Island Wren.
DQKr TIL Monaco has an unemployment rate of 0%
EgOpW TIL the production of the Barbie movie required so much pink that they caused a run on the world's supply of pink paint. Due to supply chain issues because of covid there was limited quantities which the company that provides materials for the film industry used for the film.