One of the most mysterious and frightening entities in medicine are prion diseases — rare neurodegenerative disorders that are usually infectious in nature but involve not bacteria or viruses, but proteins. Prions are misfolded proteins that can induce normal proteins to become misfolded as well, resulting in a chain reaction that leads to irreversible brain damage and death. What makes prions alarming is that they are incurable, can incubate for decades in a person's brain without symptoms, ...