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TIL of “learned helplessness”, when an organism has endured enough averse stimuli which it was unable to escape or avoid, it gives up and becomes unable to learn escape in the future, even in situations where such behavior would be effective

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0wnv1 TIL Most humans see about a million colors due to three retinal cones: red, green, and blue. Some humans have a fourth cone for orange light and can see 100 million variations in color.
gwr4 TIL that the Soviets dumped 17,000 containers of nuclear waste, 14 nuclear reactors, and more in the Kara Sea. Including one submarine that may re-achieve criticality and explode.
ZQK4 TIL: The vast Library of Congress (paper) card catalog is abandoned in place, gathering dust in the basement
l78NK TIL about the church of the Flying Spaghetti Monster that practices Pastafarianism. Said monster created the universe while drunk. It's version of Heaven includes a beer volcano and a stripper factory.
5VP19 TIL: The image where the tongue folds the tip backwards and goes all the way into the nasal passage way is real- its name: Khechari Mudra.