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TIL The "Jesus Nut" or "Jesus Pin" is the only component holding the rotor blades on certain helicopters. It was nicknamed during the Vietnam war because if it were to fail in flight, the rotor blades would lift off of the helicopter and the crew would have nothing else to do but pray to Jesus.

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JAvv TIL of le Chevalier d'Eon, a French diplomat that lived alternatively as male or female. There was a betting pool over his real gender (male) that closed only after his autopsy.
R7oo9 TIL - It is well documented that for centuries, Koreans ate much more food than their Asian neighbors. A 19th century visitor wrote: "When it comes to serving fruits, for example with large peaches, even a person with the most restraint eats around ten; it is not uncommon to see a person eating 30".
nWnWo TIL there was a short-lived country in Africa named the Republic of Maryland, settled by freed slaves from the US state of Maryland. Their governor was named John Brown (different one) and then they got annexed by Liberia.
neZpr TIL that the Japanese language has only 100 syllables. But, it takes knowledge of about 1900 characters to write words with them. English has over 2600 one-syllable words, and thousands of different syllables, all of which are written using only 26 characters.
v1QW7 TIL In 1976 an International Banana Club was founded and eventually grew to 35,000 members in 17 different countries. Members received nicknames such as "Top Banana" and could obtain a degree in "Bananistry". President Ronald Reagan was a member of the club.