Throughout history, a rare genetic abnormality called hypertrichosis -- sometimes referred to as the werewolf or wolf-man condition -- has caused people to grow hair all over their bodies, including famous sideshow performers like Julia Pastrana and Jo-Jo the Dog Faced Boy.

Scientists think they may now finally understand what causes the condition after studying the DNA of a hypertrichosis sufferer in China who has hair over 96% of his body.

(New Scientist)