[tgbugs]

This points to a potential answer to a long standing question I've had about why some hairs stop growing at certain lengths. If the force is being generated by cellular migration then control over when to stop growing can be mediated by a signal that tells the cells to stop migrating, and that could be based on time or vibration amplitude or something else that correlates with hair length. For hair that grows continually you just ... never turn off cell migration.

[firmretention]

I don't believe any hair on the human body truly grows continuously. Even head hair has a lifespan of ~7 years and whatever you can grow in that time is the max. I was a big metalhead in high school and grew my hair out. Indeed, after about 7-8 years it stopped getting longer, right at about waist level, and was stuck there until I finally got sick of it and cut it off.

[doubled112]

I think they call this the "terminal length". As long as it will grow before it falls out.

[dbbk]

Oh my god I have always asked why eyebrows stop growing and NOBODY ever thinks about it.

[JumpCrisscross]

> why eyebrows stop growing and NOBODY ever thinks about it

If you clip your eyebrows, will they grow back to their original length? Or is there a process that generates an eyebrow hair and then stops after a pre-determined length of time (with periodic shedding)?

[saltcured]

Wait until you get older, and you either start trimming them or considering some kind of Yellowbeard style braids