I love this. It's the closest we humans get to come to having rings like trees. Even more interesting than being able to read a person's circadian rhythms in their hair is the finding that people's clocks didn't shift as far their schedules. That explains so much about my life!
http://blogs.discovermagazine.com/80beats/2010/08/23/your-circadian-rhythm-is-recorded-in-your-hair-or-your-beard/
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