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TIL that several filmmakers documented the construction of the Gateway Arch in hopes that the legs wouldn’t meet. To insert the keystone, firehoses had to cool the arch due to thermal expansion and the legs had to be hydraulically jacked apart.

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VMM6Z TIL that the words celadon, gargantuan, and malapropism, as well as many others are actually characters from stories that later entered common language.
65kY TIL in 1992, a Lawyer and a Judge were looking for files on a former prisoner in a police station near Paraguay. Instead, they stumbled upon archives documenting an international conspiracy involving the torture, murder, and imprisonment of 480,000 people, now known as the Archives of Terror.
ZpP4B TIL in 1976 groundskeeper Richard Arndt caught Hank Aaron's 755th home run ball & tried to return it to Aaron but was told he's unavailable. The next day the Brewers fired Arndt for stealing team property (the ball) & deducted $5 from his final paycheck. In 1999, he sold it at auction for $625,000.
QJyNE TIL Janet Jagen is the first American woman to be become president of a country. She was born in Chicago, moved to Guyana, and was elected president there.
9w7ap TIL that astronomers regularly observe mysterious lights and temporary changes in structure on the surface of the moon. "Transient lunar phenomena" have not been fully explained, and are almost never observed at two different places on Earth at the same time.