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TIL since 1974, South Korea has discovered four tunnels dug by North Korea with black-painted walls to make them look like coal mines.

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ADWmx TIL the Colt Walker revolver was the world's most powerful repeating handgun from 1847 until the .357 magnum cartridge was invented in 1934. It was designed to be able to kill an enemy's horse in one shot.
5YVJr Characterized by their large green bodies and beak-like teeth, bumphead parrotfish can be found near the coral reefs of the Indo-Pacific. These large corallivores use their mighty teeth to grind up the hard exterior of coral in search of the small creatures living inside. If you've ever visited a beach in these regions, you've probably relaxed on the sandy remnants of this coral-based diet. In other words, that beach is full of crap! National Geographic grantee Mikayla Wujec fills us in in this episode of Today I Learned.
6E58Q TIL When a Dominos customer regular didn’t place an order after 2 weeks the store employees went to check on him and found he was in need to urgent medical attention. It most likely saved his life
Vwp8 TIL Maurice Sendak, author of Where the Wild Things Are once replied to a young boys fan mail with a hand drawn picture of one of his characters. The boy’s mother wrote back saying simply “Jim loved your card so much he ate it.”
jbpp TIL of “learned helplessness”, when an organism has endured enough averse stimuli which it was unable to escape or avoid, it gives up and becomes unable to learn escape in the future, even in situations where such behavior would be effective