Rare human body features you didn’t know exist

With billions of people walking on this planet, it's no surprise that we're all unique. And while we have many common features in our bodies, it's only natural that there are some that are truly rare and different. But some of these differences are especially extraordinary on a biological level. From a rare blood type to additional ribs, and an immunity to sleep deprivation, you'd be surprised to learn that these body features actually exist.
Read on to discover some of the rarest features very few people have.
Rare human body features you didn’t know exist