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TIL that about 90–95% of the body’s serotonin is made in the gut, not the brain. Intestinal cells and gut microbes regulate its production, and while it mainly controls digestion and inflammation, it also influences brain signaling, mood, and risk for conditions like depression and anxiety.

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via reddit.com

v1E0j TIL the tomato is a berry. Its English name derives from the Aztec word for "fat or swelling fruit," and its Latin name literally means "wolf peach."
j6erp TIL in 2005 pro golfer John Daly sued a Florida newspaper for saying he failed “the scoundrel sniff test”. The case was thrown out because Daly couldn’t disprove any of the statements made in the article.
jNZbj TIL the F-82 "Twin Mustang" fighter plane, designed to escort bombers thousands of miles to Tokyo, was literally two P-51 Mustangs joined at the wing. Both cockpits were fully functional, so one pilot could sleep while the other flew the plane on missions that could last up to 12 hours.
lokAa TIL researchers have been working for years to develop a strain of coffee plant which is naturally decaffeinated. While they made progress, there's a big drawback. Caffeine functions as a natural insecticide. By removing it from the plant, you leave the crop more vulnerable.
OGPBe TIL of the 1850 shipwreck of the Jenny Lind on a South Pacific coral reef. 28 people survived for 37 days on a tiny patch of sand because a passenger created a water distillation system from salvaged cookware capable of making 25 gallons a day of freshwater.