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TIL George Reeves, the actor who played Superman in the 1950s was wary because some fans tried to test his “invulnerability.” At one appearance a young fan pulled a pistol on him. Reeves convinced him to hand over the gun by telling him that a bystander could be hurt when the bullets bounced off

8ajPV TIL that Robert Ballard's discovery of the Titanic in 1985 was actually a by product. The expedition which found the wreck was funded by the US government to study the effects of radiation from two US Navy submarines which had sunk in the 1960s. The Titanic search was a cover.
Amgw TIL: “Generational Curses” may be a real thing. There was a study where mice were given a small shock to the foot at the same time as the smell of acetophenone. After 10 days, they mated. The children mice inherited a fear of the odor even though they had never been exposed to it before.
rRelW TIL Ed O'Neill used to make birthday phone calls to fans of ‘Married With Children’ in character, and in true Al Bundy nature, he only called them collect.
LY10 TIL In the 1930s two psychologists adopted a baby chimp and tried to raise her as their child alongside their real infant son Donald to see if this caused the chimp to learn human behavior. They stopped the experiment after 9 months because their son actually started behaving more like a chimp.
ANkkl TIL if you assume an event has a 1 in x chance of some outcome, and you perform that event x number of times, you have a ~63% chance of getting that outcome