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TIL due to a campaign in the 1970s, “Square Dancing” is the state dance in 75% (24 out of 32) of US States that list one.

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JY1Xm TIL: Any American can add an uninhabited island to the US as long as it has bird poop on it
xVpX0 TIL Doris Day turned down the Presidential Medal of Freedom, an honorary Academy Award and Kennedy Center Honors Award because her intense fear of flying made it impossible to accept the awards in person.
O4ML TIL the ‘Yin and Yang’ symbol was actually a shield design from the late Roman Army, and predates Taoist representations by almost 700 years
EGgd TIL for the first Moon landing, the average age of NASA controllers was 26 years old.
oB14Y TIL barns were originally a red color because of the linseed oil and rust farmers used to paint them - this mixture dried quickly and prevented things like fungi, moss and mold from growing, as well as providing a long-lasting coating. Barns today are still painted red in honor of this tradition.