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TIL a college student aligned his teeth successfully by 3D printing his own clear braces for less than $60; he’d built his own 3D home printer but fixed his teeth over months with 12 trays he made on his college’s more precise 3D printer.

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Bg6e TIL that Union General John Sedgwick’s last words were, “I’m ashamed of you, dodging that way. They couldn’t hit an elephant at this distance.” He fell over with a bullet hole under his left eye seconds later.
oBYmr TIL that a heavily-promoted 1979 American sitcom about black congressman did not air due to opposition from the Black Congressional Caucus, who feared that airing "Mr. Dugan" would be "disastrous, showing a (black) congressman who was a silly, incompetent man ruled by his staff"
xr8k TIL that when Martha Washington recalled the two saddest days of her life the first was December 14, 1799 when her husband died. The second was in January 1801 when Thomas Jefferson visited Mt Vernon. “Next to the loss of her husband” Jefferson’s visit was the “most painful occurrence of her life.”
wLVpE TIL that Misophonia (also called "sound-rage" syndrome) is a condition in which strong negative emotions and physical reactions (e.g. sharp anger, aggression, pain) are triggered by specific, common sounds.
OLLX TIL that in 1945, Dwight D. Einsenhower predicted that people would try to dispel the holocaust as a falsehood, and ordered all possible photographs taken of the Nazi crimes to hinder any such attempts.