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TIL ultrahigh-energy cosmic rays, the most energetic particles known to humans, all come from the same region of the universe and are caused by an physical process of unknown origin. The most powerful cosmic ray ever recorded carried energy of 300 billion billion eV.

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9Z1m TIL that the NFL cannot host games on Fridays or Saturdays until late December as federal law prohibits professional football leagues from competing with college or high school football, which typically host games on those days.
VMK1Z TIL until 1929, less than 100 years ago, man didn't know there were other galaxies outside of the Milky Way. Edwin Hubble and his "computer", a woman named Henrietta Leavitt calculated stars called cepheids could accurately measure long distances, proving the Andromeda "nebula" was a separate galaxy
Zp0Vo TIL that the founder of Chili's restaurant chain, Larry Levine, was inspired to open a restaurant that served chili and burgers and had the friendly environment of the chili cookoffs his Father in-law hosted. His FIL was famed racing driver and performance car constructor, Carroll Shelby.
Wko69 TIL that the King Cobras are cannibals, they eat other snakes. Its venom is a pure neurotoxin. It kills by asphyxiation, brings a complete shutdown of the neuro system and breathing collapses. They can grow up to 18 feet long, king cobra can raise a third of its body and look a human in the eye.
womeE TIL that in Soviet-occupied Estonia, 1980's TV show Dallas became popular on modified TV's when it aired in Finland. Thousands of people would drive to the northern tip of Estonia just to watch the show.