Your eyebrows are there to keep sweat from trickling into your eyes. The hair in your nose makes it harder for germs to invade your airways. And the hair on your head keeps you warm. But what biological purpose could hair on your knuckles possibly serve? Anthropologists have studied what’s known as mid-phalangeal hair for the better part of a century, and to date, no clear reason for its existence has been found. What we do know is that hair on the top part of your fingers is a genetic trait. It appears most often on your fourth finger and doesn’t appear on thumbs. It’s most common among Caucasian people. Women with mid-phalangeal hair often have negative side effects like mood changes and painful periods when they take birth control pills.
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