By now you're no doubt aware that no two people are exactly alike. Everyone has their differences, features, and traits that make them unique.
But what you might not know is that those differences can run deeper than you might think.
Take, for example, the palmaris longus. The palmaris longus is a muscle that runs from the elbow down to the palm. Functionally, this muscle makes it easier for the hand to grip things.
It becomes most visible in the wrist. Here's mine:
This very same muscle is present in cats, and much like a human's grip, cats rely on the palmaris longus to retract their claws.
Alright already! What's so special about this muscle? Why do I keep going on and on about it? — I'm glad you asked: 14% of all peopleDO NOT have this muscle.
Some people only have it in one arm and not the other, while others don't have them in either arm.