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TIL you shouldn’t brush your teeth within 60 minutes of eating a meal as your acidic oral pH makes your tooth enamel too easy to brush away

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aw5XN TIL after his father and brother were killed by Confederate Home Guard, Henry Berry Lowrie led a band of American Indian, White, and African-American men in a guerrilla war against the Confederacy and later the upper class. He obtained a Robbin Hood like status and vanished without a trace in 1872.
N9YN TIL that during WWII, Gurkhas, for fun, would crawl through enemy Japanese lines, sneak up on the sentries, cut their shoelaces and then return without being detected.
OKw6 TIL of Positronium, a nearly massless element made out of a meta-stable mix of matter and antimatter with no protons or neutrons. It can even form chemical compounds such as Positronium Hydride. When it does collapse, it releases pure energy as flash of gamma radiation, leaving nothing behind.
JYvek TIL about the Berkeley Pit, a 270-metre deep US "lake" filled with liquid toxins and acid. Thousands of geese died upon landing in it one night; today, birds are scared off the site with gunshots. The state of Montana charges every visitor to the lake 2 dollars. It has its own gift shop.
JYr0V TIL that Christopher Collins, the voice of Starscream in the original series, also voiced Cobra Commander in the 1983 G.I. Joe cartoon. Making him the voice of two classic bad guys for an entire generation. He later went on to have a successful stand-up comedy career.