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TIL During the Korean War, after failing to weaken the Chinese forces through attrition, the United States carried out the most concentrated bombing campaign in history which killed over 20% of North Korea's population and thoroughly wiped out "every city, down, village" in the country.

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epM5J TIL that in the short story "Button, Button" (press button, get $ and someone you don't know dies) the husband dies because the wife didn't "really" know him and the author hated the Twilight Zone ending where the button was given to a stranger after being pressed
oBWXY TIL smartwatches measures blood preassure by emitting light to the skin and reading how much light is reflected back; as the heart pumps blood, it causes a variation in blood volume on the skin and can be detected by change in light absorption, a not-so-new technology called photoplethysmogram.
Dy4r TIL: GM bought out street car companies and tanked them, to sell more cars
ZpPRY TIL John Travolta was first considered for Forrest Gump but declined, opening the door for Tom Hanks. Bill Murray was also considered. Joe Pesci was a contender for Lieutenant Dan, but Gary Sinise got the role. Dave Chappelle rejected the role of Benjamin Buford Blue, thinking the film would flop.
kJ195 TIL that Cancun did not exist as a city until the 1970s, with Isla Cancun having only three inhabitants who were caretakers of a coconut plantation