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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.

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WVOd TIL in 2009 a couple from UK started a facebook campaign to make Rage Against the Machine’s “Killing in the Name” the #1 Christmas single. The song sold 500,000 copies beating the 4 year run of X-factor winners. All proceeds went to homeless charities. More in comments.
LQMKP TIL that the Greeks had a word for something like gaslighting: eristic arguments.
XE8Vr TIL in 1916 New Jersey experienced numerous shark attacks, one shark even swam inland through a creek to kill two people.
4X0kw TIL Jay-Z's Empire State of Mind was sampled from Love On a Two Way Street by The Moments (1970)
neXN9 TIL that despite ancient Roman bridges being the first large and lasting bridges ever built, many are still used despite being around 2,000 years old.