what causes gray hairs?
In: Biology
Each strand of hair is a tube, filled with liquid called pigmentation. The thicker the liquid, the darker the color.
The color comes out of little balls in the roots of the hair. Those balls are made by the genes your mom and dad mixed together to make you.
Sometimes, things like how healthy you are or how much of the poisonous stress chemical is in your body (it stays a long time sometimes) can cause the pigmentation to leak out and your hair gets lighter or even white.
And sometimes the genes from your parents decide how much pigment you get to have and when it runs out, your hair turns gray.
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