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TIL that after becoming associated with the catchphrase “billions and billions,” Carl Sagan had a unit of measurement named after him. One sagan is equal to at least four billion, since the smallest number that may be described as “billions and billions” must be two billion plus two billion.

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KYrWE TIL For the Movie Angels with Dirty Faces (1938), James Cagney's main inspiration for playing the role of Rocky was a drug-addicted pimp, who stood on a street corner all day hitching his trousers, twitching his neck, and repeating: "Whadda ya hear! Whadda ya say!"
YWGA TIL that Ed Dwight, the first African American accepted into the Astronaut Program, left the program because of discrimination before ever going into space.
Lkpmm TIL about the Florida fairy shrimp, which was discovered in 1952 to be a unique species of fairy shrimp specific to a single pond in Gainesville, Florida. When researchers returned to that pond in 2011, they realized it had been filled in for development, thereby causing the species to go extinct.
J1BdQ TIL that an F-117 Nighthawk crashed in Sequoia National Forest in 1986, two years before the plane was publicly announced. The US Air Force established a permitter around the crash site and secretly replaced the wreckage with a wrecked F-101A that had been stored in Area 51 for this purpose.
R7b04 TIL the history of Londons stretcher railings, metal fences made from WW2 stretchers once used to carry wounded civilians during the Blitz.