William Bailey called himself a doctor, but his career was as a shady businessman, not a medical professional. In the early 20th century, he launched a series of start-up companies, capitalizing on the new discoveries of radioactive elements, and sold patent medicine products with lethal radioactive substances with unproven promises to cure everything from arthritis to impotence – it was said they could help you regain your youth. But instead, they were deadly.

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