When we start getting gray hair, we tend to blame stress -- a high-pressure job, an illness, even our unruly children.
But the link between gray hair and psychological stress is little more than folk wisdom, unsupported by numerous scientific studies. That didn't stop widespread speculation last week, in The New York Times and elsewhere, that the newly noticed salt and pepper above President Obama's temples were the first physical manifestations of some of the highest job pressures on the planet.
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