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TIL That the majority of Americans believe that violent crime rates are at an all time high, despite the fact that they have been steadily declining for decades

VMgR8 TIL that 'Moron', 'Idiot', and 'Imbecile' were once valid Psychology terms for people with low IQ. When these terms entered vernacular usage as insults, they were disused in favor of 'Mental Retardation' which in turn was disused in favor of 'Intellectual Disability'.
lNkr TIL that in Auschwitz, an SS guard fell in love with a Jewish prisoner. He saved her life multiple times and in return, she testified on his behalf during his post-war trial.
WkMd8 TIL of "Big's Backyard Ultra" a last man standing marathon, where competitors run around a 4.1667 mile loop until only one remains. Last year's winner ran a record-setting 68 laps (283.3356 miles) in 55 hours, 23 minutes. Everyone but the winner is designated DNF.
b9LG0 TIL that William Hootkins, the actor who played the rebel pilot Porkins in Star Wars: A New Hope, was questioned by the FBI after the assassination of JFK, was school classmates with Tommy Lee Jones, and studied astrophysics and oriental studies at Princeton University.
rXDe TIL that color-blindness in humans happens when a person has two visual processing cones instead of the usual three. There is a flipside, that there are people who have a condition known as Tetrachromacy, where someone has four cones, potentially allowing them to see more of the visible spectrum.