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TIL The Vatican has a telescope in Arizona. The Vatican Advanced Technology Telescope (VATT) is part of the Mount Graham International Observatory and is operated by the Vatican Observatory, one of the oldest astronomical research institutions in the world.

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AD584 TIL our species is continuing to evolve in 3 ways: natural selection (by which many are adapting to malaria and high altitudes), random mutations (increasingly likely as more older males become fathers), and a mysterious genetic repair tool that biases eggs and sperm to C and G bases over A or T.
BrLxk Today I learned that being late in Brazil is so part of the culture, if they want to start on time they say “com pontualidade britânica” which means “with British punctuality.”
D1pnv TIL that Before the Civil War, uniforms were custom-sewn. Such a massive number of people had to be outfitted that uniforms needed to be mass produced. Soldiers were put into subtypes: large, medium, and small—classifications that eventually found their way to civilian clothing.
DQdlj TIL about the Battle of Christiana, in which a group of armed freedmen fought a party of federal marshals to defend escaped slaves, killing the slaves former owner who had shouted; "I will have my property, or go to hell!". Everyone involved was later acquitted and the slaves escaped to Canada.
yV8Nw TIL Paul Anka wrote "My Way" for Frank Sinatra because Frank told him he was retiring from the music industry.