Eli5.. What keeps the hairs on my arms and legs from growing indefinitely? Why do they never get longer than like 2 cm but grow back right after shaving?
In: 4
The length of a given hair is proportional to the length of the follicle. Your arm hairs have really short follicles, so they can only get a few cm long before they fall out.
Your arm hairs are actually falling out and regrowing all the time, you just don’t really look that closely to notice it
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