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TIL in many old Westerns since nobody in charge was able to translate Native languages many Native American extras would ad-lib or make jokes in their own language.

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pbkA TIL Over 500 years ago, Leonardo da Vinci made an interesting observation about trees. He concluded that the total thickness of a tree’s branches is equal to the total thickness of the tree trunk. Trees across many species obey this rule. Explanations involve hydrological and structural theories.
be6Q TIL avocados are toxic to most if not all animals, humans are the exception
ARKo TIL that guitarist Les Paul’s right elbow was shattered in a car accident. Doctors were unable to repair it so he had them fuse his arm bones at a 90 degree angle so he could continue to play guitar.
0w7Vv TIL The famous Gauss electric flux theorem was modified in 2011 to include the charge on the Gaussian surface. It is now called Generalized Gauss's Theorem
v1pQr TIL of "hunger stones": the Central European practice of marking river levels with carved stones during droughts, to warn future generations that there will be a famine if the water level again gets low enough to see the carving. This has been done at least since 1115, and as recently as 2018.