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TIL in 1981 members of a U.S. nuclear semiotics team believed if the world ended, survivors 10,000 years in the future might not know what the radiation symbol means. So they proposed breeding bioluminescent cats that would glow when they came near radiation to serve as living indicators of danger.

Read more theraycatsolution.com

via reddit.com

4Aag TIL that lead exposure correlates with low IQ and aggresssion, and that many violent areas in the world still use lead gasoline
m1l7p TIL that rhinoplasty surgeries date back to the sixth century B.C. in India. An Indian physician named Sushruta documented instructions in the Sushruta Samhita for performing scores of surgical procedures – including three types of skin grafts and reconstruction of the nose.
NOaP TIL that in a tragic twist of irony, Karl Marx’s grave has an entry fee to view
0xmR TIL in The Big Lebowski, The Dude’s line, “The Dude abides,” comes from Ecclesiastes 1:4, “One generation passes away, and another generation comes: but the earth abides forever”–a reference to how the Dude, much like the Earth, can weather change and chaos around him, but still remain the same.
697wX TIL the first airing of Star Trek was on September 6, 1966 in Canada, two days before the US premiere.