The plague was once the most feared disease in the world, capable of wiping out hundreds of millions of people in seemingly unstoppable global pandemics and afflicting its victims with painfully swollen lymph nodes, blackened skin, and other gruesome symptoms.

In 17th-century Europe, the physicians who tended to plague victims wore a costume that has since taken on sinister overtones: they covered themselves head to toe and wore a mask with a long bird-like beak. The reason behind the beaked plague masks was a misconception about the very nature of the dangerous disease.

During that period's outbreaks of the bubonic plague—a pandemic that recurred in Europe for centuries—towns gripped by the disease hired plague doctors who practiced what