8 Quirks You Might Have That Are Actually Super Rare
7. Palmaris Longus
This one is not so much some you have as something you don't.
The palmaris longus is a vestigial tendon in the forearm. Its purpose varies in the animal kingdom, some use it to draw back their claws, others, such as orangutans, use it when swinging through trees. In humans, it does precisely nothing. This makes it a popular candidate in reconstructive surgery, as it can be removed with no ill-effects.
The palmaris longus in humans is variable, and the most common variation is that it's missing entirely. Around 14% of people won't have one.
You can check yours by touching your fingers and thumb together and flexing your wrist. If you don't have one, the good news is that you might be some kind of higher-evolved being. The bad news is that doctors won't be able to use it to put you back together, should you ever suffer a horrible accident.