In the 1920s, young women painted glowing radium onto watch dials and, for fun, onto their fingernails and teeth, told the miracle element was perfectly safe. It was killing them. This deep dive tells the heartbreaking, revolutionary story of the Radium Girls, whose suffering and perseverance forged the workplace safety standards we rely on today.

We follow the 'lip, dip, paint' technique that fed radioactive isotopes directly into their bodies, the corporate cover-up that hired fake doctors and blamed syphilis, and the landmark legal battles in New Jersey and Illinois that established a worker's right to sue. Their sacrifice reshaped labor law and the science of radiation safety.

• Why radium mimics calcium and lodges in bone, causing the horrific condition known as 'radium jaw'
• The factory's hazmat-clad chemists versus ba ...