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Old 04 January 2012, 01:27 PM
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Lainie Lainie is offline
 
Join Date: 29 August 2005
Location: Suburban Columbus, OH
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I don't think it happens overnight, but sometimes people's hair does change, apparently spontaneously, from curly to straight or vice versa -- and back again. Which is fascinating, because it means the shape of the hair follice changes.

Here's an NPR article about it.
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