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TIL Unobtainium was not first referenced in Avatar (2009), actually dates back to the 1950s as a term for "unusual or costly materials"

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PxNO TIL that when you learn some (usually obscure) fact, word, phrase, or other item for the first time, then encounter that item again, perhaps several times, shortly after having learned it, is called The Baader-Meinhof phenomenon.
e0BnE TIL 50%—80% of your poop (excluding water) is bacteria that had been living in your intestines. Many of the bacteria in poop are still alive, but some are dead—carcasses of species that bloomed as they fed on the indigestible plant matter you consumed, then died shortly afterward.
bk07 TIL Babies as young as 9 months know what makes a friend,new research suggests. A study conducted in January in the Journal of Experimental Psychology: General, shows that babies who are too young to talk still have a set of abstract expectations about the social world.
OovgL TIL Morocco was the first country to recognize America as a legitimate nation.
OoX0X TIL Sylvester Stallone starred in a softcore porn movie called The Party at Kitty and Studs prior to Rocky and he made $200 on it and the filming only lasted two days.