In the isolated highlands of Papua New Guinea once lived a tribe of people called the Fore. The Fore were untouched by the outside world until the 1930s, and unstudied until the 1950s. When researchers finally made their way to the highlands, they discovered that an epidemic called the “laughing death” was killing women and young children. The “laughing death” was caused by eating human meat.
What baffled researchers, according to NPR, was that kuru wasn’t a virus or a living bacteria. Instead, it was a strange process that researchers compared to Dr. Jekyll’s transformation into Mr. Hyde—the thin line between good and evil crossed by a twisted protein, one that tricked other proteins in the brain to twist like it, damaging the brain’s cerebellum.
The Fore people stopped eating their dead half a century ago, but the epidemic spanned years, with the last victim of kuru dying in 2009—the disease can lie dormant for years before attacking the brain. But similarly confusing diseases are still out there, like mad cow disease, which also originates in infected meat. Just not, you know, human meat.