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TIL the Unisphere, built in Queens, NY for the 1964 World’s Fair, had lights representing the capitals of the nations of the world, including one indicating the location of the Kahnawake Indian Reservation for the Mohawk Indians who helped build the monument.

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9YQxM TIL about Operation Yellow Ribbon - where Canada grounded 230+ planes as quickly as possible on 9/11 to keep them out of US airspace and away from potential targets. Canadians hosted thousands of passengers stranded in Canada until U.S. airspace was reopened.
1axd4 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.
ky81 TIL of a book entitled Atlanta Nights that was written by a group of sci-fi authors to be intentionally terrible as a test for the publisher PublishAmerica. It included a chapter containing computer generated random sentences and two word for word identical chapters. The publisher accepted it.
ep7N5 TIL, for a scene in his movie Tenet, where a Boeing 747 plane crashes into (a fictional) Oslo Airport, they crashed an ACTUAL, REAL 747, because Christopher Nolan determined it would actually be cheaper than models or CGI.
R5N56 TIL that dwelling too much on happy memories can lead to "sentimental longing," which is a dangerous form of noatalgia that makes us think "today must be bad, because yesterday was better."