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People have wondered for
about the
between stress and greying hair. It is believed that France's Queen Marie Antoinette's hair turned white the
before she was beheaded during the French Revolution in the late-eighteenth
. More recently, we have witnessed the
of presidents and other world leaders quickly lose color. The strains of leadership seem to go to the
of things, especially hair
. Professor Hsu said the loss of the pigment-regenerating stem cells cannot be reversed. She said: "Once they're gone, you can't regenerate
any more. The damage is permanent." Worryingly, she hypothesised that
could be responsible for accelerating the
process.