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How Does Hair Know When to Stop Growing?

Nov 16, 2016 by Thumper Massager

Gents across the world are growing their facial hair for Movember, but have you ever wondered why certain types of hair (like the hair on your head) keeps growing, while others (like your arm hair) stop at a certain point? How does hair know when to stop growing? To learn more, watch the video below:

 

https://youtube.com/watch?v=rf6BnOLb5xs%3Frel%3D0%26showinfo%3D0%2520frameborder%3D0%2520allowfullscreen