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TIL Mammoth Cave is the world's longest known cave system. More than 420 miles of passageways have been found in Mammoth Cave. This is almost twice as long as Sac Actun in Mexico, which is the second-longest cave system.

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yVO8X TIL that no team has won the World Cup with a foreign coach. Only 2 foreign coaches have reached the final match: George Raynor of England, with Sweden in 1958, and Ernst Happel of Austria, with the Netherlands in 1978.
rRmKo TIL that Gail Halvorsen, a US pilot, would drop candies for German children in late 1940s Berlin. To not injure them, he would fabricate parachutes out of handkerchiefs and tied them to the rations.
nROY TIL that a Roman Mile was defined as 1,000 paces. Armies would leave mile markers every 1,000 steps as they marched; as a result, well-fed armies marching at a fast pace marked longer miles.
JKav TIL Jim Henson once made 179 ads for a Wilkins Coffee company that depicted ‘Muppet-prototypes’ where one puppet who didn’t drink Wilkins Coffee would get injured and beat up by another puppet, he later went on to become Kermit The Frog and signed a deal with Wilkins Tea
gMOJL TIL the 1994 LA Marathon was won by a 'Rabbit' (pace setter) who was so far ahead he just kept running instead of dropping out as planned.