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Web Date: February 28, 2008

Water Leaves Trail In Human Hair

Oxygen and hydrogen isotope ratios tell where a person has been
Department: Science & Technology

Be careful where you drink. A University of Utah team led by geochemist Thure E. Cerling and ecologist James R. Ehleringer reports that the isotope ratios of human hair correlate with the isotope ratios of local tap water and can be used to track where people have been (Proc. Natl. Acad. Sci. USA 2008, 105, 2788).

The team collected samples of barbershop hair clippings and drinking water from 65 cities in . . .

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