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TIL Highlighters are typically yellow because it is the color that doesn’t leave a shadow on the page when photocopied

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nee4G TIL In the Star Trek TOS episode “The Conscience of the King”, in the 1960’s-style cocktail party scene, the party music is a subdued version of Star Trek theme song, meaning the Star Trek theme song exists within the Star Trek universe.
45A5 TIL many german cities have artificial hills known as Schuttberge, created after WWII to deal with the debris of the destroyed buildings
M8kb TIL the top sumo referees carry a dagger, to symbolize killing themselves if they make a bad call
kJ1LB TIL that the "all persons are fictitious" disclaimer on most Hollywood movies is a response to a 1933 lawsuit over a film about the 1916 assassination of Rasputin. The wife of one of the people involved with the plot successfully sued MGM for invasion of privacy and libel.
dDLXZ TIL about humorous variations of Murphy’s law. Some best ones include: Fetridge’s law which states that important things do not happen when they are supposed to, especially when people are looking & Patrick’s theorem: If an experiment works, you are probably using the wrong equipment