Top 10 useless body parts
When you're sick you may feel that certain body parts are more trouble than they're worth. And in some cases, you'd be right. While the human body has evolved and adapted significantly since the caveman days, a few biological traces of our prehistoric ancestors still remain with us in the form of freeloading body parts we lug around with us, but have no use for. Take a gander at the top offenders! 10. Plica semilunaris You may not know it, but you have a third eyelid . Pull open the two more noticeable eyelids and take a look -- it's located right in the corner by the tear duct. This small third eyelid is left over from what's known as a "nictitating membrane," which is still present in full form in some animals including chickens, lizards and sharks. 9. Body hair No doubt we were once hairier. Up until about 3 million years ago, we were covered with body hair. But by the time Homo erectus arrived, the ability to sweat meant we could shed our wool