Rare Human Body Features: 8% Have This Unique Trait

Human body is so cool and full of surprises and unexplained features. What's the strangest body ability you can think of? Chimp-like feet, a small hole near ears, double row of eyelashes or the ability to bend your thumb backwards? Here're 18 rare body features I googled today. They all exist and there's a chance some of your friends has this feature.