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TIL Human teeth are the only part of the body that cannot heal themselves. Teeth are coated in enamel which is not a living tissue.

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epkp4 TIL about the cosmic lithium problem: Post-Big Bang, the universe had mainly hydrogen and helium, with traces of lithium and beryllium. Surprising, there's 3x less lithium in ancient stars than predicted and scientists aren’t sure why.
1aaA8 TIL: In the state of Maryland, one is required to declare a "belief in the existence of God" in order to serve any public/elected office of profit or trust. (Article 37 of the state constitution)
eQOJ TIL while it’s only impossible to go faster than the speed of light in a vacuum, it’s definitely possible for some things to go faster than light in air or water, and when they do, the air or water starts to glow blue
x6y7w TIL Big Boy was more a chain of chains; and "Several of them also held Kentucky Fried Chicken franchises and sold that chicken in their Big Boy restaurants"
OoO1L TIL in the popular two-player strategy board game, Chess, if a pawn reaches the other end of the board it can turn into either a queen/knight/bishop or rook.