Many are
born with pin straight hair, while others have wavy or curly hair.
Unfortunately, their hair doesn’t stay that way for very long.
The
strange tendency of hair to change its shape, in spite of genetics,
has some scientists baffled. Even if a girl has straight-haired
parents, her hairstyle may take on a different look in around seven
to ten years. There might not be an answer to this mystery anytime
soon, but scientists believe hormones play a critical role here.
