The bacteria that cause the plague have killed many people throughout history.¹ Scientifically named Yersinia pestis, the bacteria enter human and animal bodies often through flea bites.

The vast majority of modern medicines are toxic at high concentrations or when misused, but they can promote health at low concentrations and when they are carefully applied. Thus, the very same compound can confer both beneficial and deleterious effects, depending on how it is utilized. Illustrating this, a new medicine to slow brain cancer is on its way—and it comes from scorpions!