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TIL of Lake Karachay, a lake in Russia that was used as a radioactive waste dump, and has been described as the most polluted place on the planet. Standing on the shore for an hour would give you a lethal dose of radiation.

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v19lR TIL that the Curiosity and Perseverance Mars rovers each had just 256 MB of RAM and 2 GB of Flash Storage on board.
b99M7 Scientists have found an underlying reason why it's dangerous to drive when you're sleepy. Brain recordings show cells involved in perception fire more slowly in somebody who has been up all night.
WEw8 TIL a father and his autistic son were stranded in the Atlantic ocean. They repeated “To infiniti and beyond” to keep track of each other for 15 hours before being rescued.
XmL8 TIL a British soldier was cut off from his regiment in 1914 and managed to hide in occupied territory in a wardrobe for 4 years with the Germans at one point even helping to move the wardrobe with him in it.
GAv0G TIL that in ancient Rome plebeians would leave the cities during the "secession of the plebeians." This left the elites to fend for themselves.