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TIL You’re not supposed to rinse with water after spitting out toothpaste

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GY4Z1 Today I learned that when Alexander the Great conquered Egypt, many Greek-Romans came to Egypt as tourist. Many of them ended up carving their names stating “so and so was here, and the work of these Egyptians are great” in the tombs of the Valley of the Kings.
GAQ8E TIL that Cristiano Ronaldo was named after Ronald Reagan, as his father was a big fan of the president.
OGala TIL although "The Art of War" is popular among businessmen, the actual Chinese classic for business is "The Book of Swindles." Written by a travelling merchant in 1617 and using actual court cases as examples, it mainly discussed how to avoid swindles AND how to commit it vs. your business rivals.
4X1Xw TIL of Project Pigeon, in which American behaviorist B.F. Skinner attempted to develop a pigeon-controlled guided bomb during World War II.
xYrk TIL Columbine shooter Eric Harris encountered Brooks Brown, an acquaintance; Brown commenting about Harris missing a test, “It doesn’t matter anymore.” Harris then elaborated: “Brooks, I like you now. Get out of here. Go home.” Brown, feeling uneasy, walked away.