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TIL researchers found naturally occurring lithium in the water supply lowered suicide rates. They were able to measure lithium levels in 27 Texas counties and show those with more lithium in their water had fewer suicides. Similar studies in Greece, Austria, & Japan corroborated the results.

j6VMX TIL: In China wearing a green hat is a sign of mockery and telling someone they wear a green hat is an insult. This signifies that the person is a cuck. One reason is that during the Yuen dynasty, family members of prostitutes had to wear green headscarves so the public can identify and avoid them.
e4M4 TIL 40,000 Vikings with 700 ships besieged Paris in 885 AD but could not take it and gave up, thanks to the defensive efforts of King Charles the Fat and his Warrior Bishop
RW7j TIL Dolphin teens get high by chewing pufferfish and even pass it around. They then swim to the surface and zone out to their own reflections.
nex69 TIL that in the 1950's, donut shops were some of the first food businesses commonly open late at night. They became hot spots for police working the night shift since it gave them a place to grab a snack, fill out paper work, or even just take a break. This is why donuts became associated with cops.
BgrNL TIL about Agloe, New York. A fake town created by a US map company as a copyright trap that became real when a man put a general store there and named it after the name he saw on the map. The map company learned about this right when they sued a competitor for plagiarism and thus lost the case.