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TIL pygmy seahorses are tiny fish that are nearly indistinguishable from their habitats due to their size and extreme camouflage. They are so well camouflaged that Bargibant’s pygmy seahorse was only discovered after a host gorgonian was collected and observed by marine biologist George Bargibant.

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l7EN1 TIL Major General Smedley Butler, USMC testified he was asked to take part in a military coup to overthrow FDR
WyA9 TIL Ian Fleming named James Bond after an American bird expert and stated he chose the name because he wanted Bond to be “an extremely dull, uninteresting man to whom things happened…I thought by God, James Bond is the dullest name I ever heard.”
8a9YX TIL about a fatal submarine accident from 1963. A nuclear sub, the USS Thresher (SSN-593), sank 610 m (2,000 ft) imploding in 0.1 seconds killing all 128 crew members. During a failed deep dive test, its theorized the sub lost power and its vital ballast systems froze, rendering the ship unusable.
VMkXm TIL of William Rankin, a fighter pilot who survived ejecting into a thunderstorm. He encountered very low temperature, frostbite, massive wind and lightning, severe decompression, and nearly drowned from breathing in rain water. Overall, he was in the cloud for more than 40 minutes.
p8Jd8 TIL: Power lines are made of aluminum and not copper because even though aluminum lines must be 1.5 times thicker to match the same conductivity, they're still 2 times lighter.