Issue Date: March 3, 2008
Water Leaves Trail In Hair
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 18 states. A regression . . .
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