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TIL that the International Morse code distress signal <SOS> does not stand for anything. It was adopted due to being easy to remember and broadcast even for people unfamiliar with Morse code, being a continuous sequence of three dots, three dashses, and three dots, with no spaces.

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R7P48 TIL That Makoto Iwamatsu (Mako), voice actor for Iroh in Avatar the Last Airbender, was born in Kobe Japan, lived through the bombings of WWII, then later moved to the United States and joined the US Military at the age of 17.
WJOo TIL in pre-modern Europe, Outlaw or Outlawry, was one of the harshest punishments available and put the criminal outside of any legal protections, subject to persecution, murder etc. by anybody. It was considered a death sentence but not carried out by the state.
pB18 TIL the first scene of the first episode of the TV show “Seinfeld” consisted of Jerry and George talking about the button’s on George’s shirt. During the last scene in the last episode, they have that exact same conversation word for word, effectively making the show come full circle.
Zpe1Q TIL The Deep Purple song Smoke on the Water is about an incident at a casino where Frank Zappa was playing a concert and a fan fired a flare gun which caused the casino to catch fire and burn down.
x6ek TIL in 1951, a doctor took cells from Henrietta Lacks without her knowledge while she was being treated in Johns Hopkins’ Negro ward. HeLa cells have led to many medical advancements, and people have made millions off her cells. Yet, she is unknown & her family can’t even afford health insurance.