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TIL that the legs of the 630 foot 192 m) Gateway Arch in St. Louis, MO had to be built with a 1/64” (0.4 mm) tolerance so that they would meet at the top. Several filmmakers documented the entire construction in hope that the legs wouldn’t meet.

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l89r TIL that there is a giant water vapor cloud in the middle of the cosmos that is 12 billion light-years away, is 100,000 times larger than the sun, and holds about 140 trillion times more water than all of Earth’s oceans.
nWppP TIL about the Liber Paradisus (Paradise Book), a law text promulgated in 1256 by the city of Bologna (Italy) which proclaimed the abolition of slavery and the release of serfs. On 25 August 1256, the head of city government announced the liberation of about 6,000 serfs, owned by 400 lords
dvVZ TIL that roosters are genetically programmed to crow every morning just before dawn. When secluded in a dimly lit room they still crow just before dawn.
MJOb TIL the Church of Scientology ran several smear campaigns against author Paulette Cooper, one of their critics, including Operation Freakout, the goal of which was to have her admitted to a mental institution. Another, Operation Dynamite, used Cooper’s fingerprints to send bomb threats to the Church
kOl8E TIL that in LA in the 40s Rachmaninoff got invited to a party at Stravinsky's house by Stravinsky's wife. When Stravinsky opened the door that night to let a guy in, Rach was standing there with a huge jar of honey and Stravinsky was really confused, but invited Rach inside and they became friends.