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TIL that it was calculated that it would have taken the concrete for the Hoover Dam 125 years to cool if it was poured as one continuous pour. Instead giant concrete blocks in columns were poured and then cooled by a series of internally contained pipes of cold water, greatly reducing cooling time.

Rxe7 TIL that in the state of Michigan, you are never more than 6 miles from a natural water source and 85 miles from one of the Great Lakes.
Egr1x TIL: In 1986, one of the first computer hacks was uncovered when a systems administrator at Lawrence Berkeley Labs was trying to track down 75 cents or 9 seconds of unaccounted for server time. Cliff Stoll now runs a business selling klein bottles.
VMGEp TIL of Six Californias, a proposed initiative in 2016 to split California into six separate states: Jefferson, North California, Silicon Valley, Central California, West California, and South California. The initiative failed to meet the required signatures to make the ballot.
R7Wbl TIL Sicilian feline, Vituzzo (aka Vito), is the first Italian cat to get prosthetic legs. After his hind legs were crushed by a car in Milan and had to be amputated, he got permanent leg implants spring-loaded with joints. (This comes on the heels of British cat Oscar, the 1st ever bionic cat).
e01MJ TIL Joe Jamail was a billionaire Texas attorney, infamous in legal circles for his aggressive nature and colorful vulgarities (i.e. "you could gag a maggot off a meat-wagon"). He earned internet notoriety for a deposition video where he tried to fight the opposing counsel and the witness.