[mkaic]

IIUC, it doesn't. Hair grows for a certain time period, falls out, and regrows. The follicle has no knowledge of the length of the hair it is producing, it is simply on a grow-stop-shed cycle with a certain period.

[guerrilla]

So hairs are actually excretions, like sweat and shit.

[mkaic]

Exactly. It's like having a bazillion tiny 3D printer extruder nozzles embedded in your skin all on their own timers and flowrates.

[bee_rider]

What’s the opposite of a fun fact

[klyrs]

Teeth