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this post was submitted on 17 Aug 2023
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Hair goes through multiple phases.
It'll grow for a while, then fall out. Even beard/head hair. It just has a longer grow phase before falling out.
Which is why short hair grows an inch way faster than long hair does.
How does it know it's short?
The follicle popping it out is basically only gonna poop out so much before it poops out.
TIL Hair = skin excrement
Have you ever seen someone's arm after they have a cast taken off? Your arm hair is short because it's being rubbed off by random interactions with things (rubbing against shirts you take off/put on, your body, general use). A person with a cast on their arm protects those hairs, and when they finally get the cast off, they look like a werewolf.
It's not a satisfying answer, but your DNA tells it.
Short hair doesn't grow faster. It's a myth.
So I have a follow up question, let's say someone has 20cm long hair, all of them are that long, we don't see 5/10cm hair still growing to get to 20, I'm confused, how does that work?
You don't see them because the longer hair covers them up.
They're still there.
If it happened to big patches at once it would stand out, but that's not how it works.
Yeah it makes sense