If you aren't familiar with this story (which I wasn't), the Radium Girls were the dozens of young women who suffered from radium poisoning after working in two factories in New Jersey that used produced watches for WWI soldiers with glowing numbers. The numbers glowed in the dark because of radium in the paint, and these womens' work was hand painting the numbers on the watch faces -- dipping paintbrushes between their lips to keep the end pointy. 
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