Most of the world didn’t know anyone lived in the highlands of Papua New Guinea until the 1930s, when Australian gold prospectors surveying the area realized there were about a million people there.When researchers made their way to those villages in the 1950s, they found something disturbing. Among a tribe of about 11,000 people called the Fore, up to 200 people a year had been dying of an inexplicable illness. They called the disease kuru, which means “shivering” or “trembling.”Once symptoms set in, it was a swift demise. First, they’d have trouble walking, a sign that they were about to lose control over their limbs. They’d also lose control over their emotions, which is why people called it the “laughing death.” Within a year, they couldn’t get up off the floor, feed themselves or control their bodily functions.
Source: Cannibalism: When People Ate People, A Strange Disease Emerged : The Salt : NPR