Invention on Instagram: "In the early 1900s, radium was considered a miracle element. It glowed in the dark and was thought to have health benefits. Companies began using it in luminous paint for watch dials, and young women were hired to apply it by hand. They were instructed to lick their brushes to create a fine tip for precision, completely unaware that each lick was delivering radioactive particles into their bodies. At first, the symptoms seemed unrelated. The women experienced toothaches,