Humans Keep Growing an Extra Artery in Their Arms, And Here's Why

<img width="1024" height="415" src="https://www.sciencealert.com/images/2022/12/ArmReachesOutBehindWall-1024x415.jpg" alt="Arm Reaches Out Behind Wall"/>Evolution is a mysterious thing.

https://www.sciencealert.com/humans-keep-growing-an-extra-artery-in-their-arms-and-heres-why