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TIL that 110 years ago members of the Colorado National Guard opened fire and killed 21 coal miners and their family members when they were on strike for better working conditions.

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j0oN TIL why some people stay irrationally calm and take no action when faced with an immediate or impending disaster. It’s called “normalcy bias”.
0gr1 TIL you are allowed to bring your own parachute on a US commercial flight.
j6P7a TIL that an irrational number is called "irRATIOnal" because it cannot be expressed as a RATIO. This is probably the stupidest TIL ever, but for decades I just thought a number was called irrational because it had a never-ending decimal that did not behave in a predictable, explicable way.
YAbP TIL that Moby Dick was inspired by the sinking of the Nantucket whaler ‘Essex’ by an 85 foot sperm whale.
p8R7Q TIL that the chemical element Berkelium is named after the University of California, Berkeley, which is named after the city of Berkeley, which is named after the philosopher George Berkeley, who, ironically, believed that the physical world does not actually exist.