This is pretty cool. 

A video from Vox has recently gone viral, detailing parts of the human body that some of us have, despite them being redundant in our current way of life. 

Think the ability to wiggle your ears is a simple quirk?

Apparently those muscles actually used to allow us to gauge the direction sound came from – being able to pivot like you often see other animals do. 

via GIPHY

And newborn infants have incredible grasp considering their tiny hands – another now defunct trait from our ancestors. 

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But one vestigial structure that some people have and others don’t can be found on your wrist. 

While some have this muscle, other’s don’t! And you can find out whether you are with or without in a really simple way!