Joe+V+-+Wonders+of+Science

WONDER QUESTION: I wonder how your hair grows?
 * Your skin outgrows itself, and you have hair.
 * Hair starts to grow under your skin in a hair follicle.
 * A follicle is basically the cover of the piece of hair that's in your scalp.
 * Hair is absent at certain stages of life.
 * A bulb (part of the root) at the base of your hair is what gives it color.
 * Hair sort of grows like a plant grows, but plants need stuff like sun and water but hair doesn't.