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TIL: In 1944 Lex Luthor was the first character in a comic book (and one of the first in fiction) to use an atomic bomb. The United States Department of War asked this story line be delayed from publication, which it was until 1946, to protect the secrecy of the Manhattan Project.

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AWkl TIL Left handed soldiers prepare and throw grenades upside down because of safety pin removal
kJBxd TIL The x's on moonshine jugs indicates how many times the moonshine has been distilled on the still. A jug labeled "xxx" indicates the moonshine has been distilled three times and is almost 100% pure alcohol.
4XEkg TIL of "The Immortal Game", a casual match between chess grand masters in the interim of the first international chess tournament. Despite not being an official match, it is considered one of the most famous matches of all time.
1XW7 TIL During the making of “Rocky”, Sylvester Stallone asked Earnie Shavers (widely regarded as the hardest puncher in boxing) to punch him for real. After 1 punch, Stallone vomited.
epD4k TIL that radio waves aren’t just really high-pitched sound waves, they’re actually big light waves.