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        Strands of Evidence

        Learn how your hair may reveal more about you than you realize, including where you live and where you have been, in this story from NOVA scienceNOW. You are what you eat, and what you eat ends up in your hair. Scientists in the U.S. and Europe have used this basic idea, and some sophisticated isotopic analysis, to devise a sort of hair-based GPS tracking system. A single strand contains information on your whereabouts over the past few months, a fact that law enforcement agencies are now using to solve crimes.

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