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TIL that the original Trefoil ("Radioactive") symbol was replaced by a red, more grotesque version including a skull and crossbones (ISO 21482), after 3 people died when they carried and dismantled a Cobalt-60 radiation source, not recognizing the symbol.

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wvN7 TIL that Titanic survivor, Katherine Gilnagh, who was 16 when the Titanic sank, didn’t realise the seriousness of the ship’s situation until she reached New York. She thought that disembarking in lifeboats and being picked up by another ship was all part of the journey.
x64po TIL Ibn Baz, who was the most senior Islamic figure in Saudi Arabia between 1993 and 1999, claimed the Sun orbits the Earth.
aw6ny TIL Keanu Reeves often foregoes some of his paycheck so that producers can bring on other notable actors. On The Devil's Advocate, he reduced his salary by a few million dollars so that they could afford Al Pacino, and he did the same thing on The Replacements to be able to work with Gene Hackman.
M7Mom TIL- That the 'Mansi photograph' has been called, by National Geographic, by experts, and by cryptozoologists, the best photograph of a Lake Monster ever taken. It was taken 46 years ago and has never been debunked!
6pKl TIL president Ronald Reagan’s kids are outspoken liberals, and his son (Ronald Reagan Jr) is even an atheist.