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In regards to your hair changing color...
I'm reminded of the question, "Why are babies born with blue eyes?" If I remember my biology correctly there is a protein called melanin which adds brown color to your hair and eyes. At birth babies eyes do not contain melanin (they appear blue) however it is deposited there as time goes on.
I imagine the same thing occurs in hair folicles. I myself went from a sandy blonde to brown.
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