They grow at their natural rate but you can't shave them until the cast comes off.
why hairs grow so long on our head and shorter on arms
Most believe hairs grow from the skull, they in fact grow from the mulitidermabellum in the brain, hence the expression, as hairy as your thoughts!
Your pubic hairs grow thicker when you shave. But when you trim it grows out how it usually does.
They grow from the bottom, at the base of the follicle.
getting older
no
yes
Yes
100,000,000
The line is, "If hairs be wires, black wires grow on her head."
Curly hairs are du to the shape of its follicle (little hole where the hair grow)
The best way to grow more hair on your beard is to never shave.