Date: Around 1993
What exactly is hair made of? Why do people go bald?
Hair is mostly made of a protein called keratin that forms long
chains. Proteins are chains of amino acids, organic molecules. People go
bald primarily because of their genes. Of course some environmental stresses
cause hair loss, such as radiation exposure. Male pattern baldness is
genetic, that is heritable, and is often correlated with higher levels of
testosterone in the blood.
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Update: June 2012