The fastest growing substance in the human body is hair. Hair grows about six inches a year.
The hair has three layers. Outer cuticle, then cortex and finally medulla.
Hair is made up of a hard protein called keratin.
The hair is as strong as a steel wire.
Hair is made up of dead cells. The hair on the head of a healthy person lasts for four to six years. The hair follicles are alive.
The hair of the head acts as an insulator that protects the scalp.
The hair on a man's head is mostly black. People in some regions have red hair.
The hair that falls out is replaced by new ones. About 30 times new hair grows from the same root.
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