Precinct 333

Thursday, December 30, 2004

The Cause Of Gray Hair?

As I've been graying (and balding) over the last several years, I've often wondered why hair color changes.

Scientists looking for a cure for skin cancer have stumbled on something else: the reason why hair turns gray.

It turns out that one of the most common signs of aging occurs because of the death of stem cells that spawn the pigment-manufacturing cells called melanocytes, the scientists said. As the supply of new pigment is cut off, hair turns gray.

And here I thought the cause might be teenagers -- in particular those in my last class of the day.


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