Do you know where you come from? because science does

Hi guys,

Imagine a person that went for vacation to a different state from where there home is. During the vacation the person was attack and robbed. He/she was hit in the head, and lost their memory. The person doesn’t remember what happened and has no form of identification. Do you know how to find out where the person might be from?

Recent research indicates that the relative amounts of the isotopes of hydrogen and oxygen in a person’s hair indicate in which part of the United States a person lives. James Ehleringer, a chemist at the University of Utah in Salt Lake City, observes that the concentrations of hydrogen-2 and oxygen -18 in drinking water vary significantly from region to region in the United States. Ehleringer and his colleagues collected hair samples from barbershops in 65 cities and 18 states. Their analyses showed that 86% of the variations in the hydrogen and oxygen isotopes in the hair samples result from the isotopic composition of the local water. Based on their result, the group was able to develop estimates of the isotopic signature of peoples’ hair from various region of the country. Although this method cannot be used to find out the person's physical address, it can give a general region. This method might be helpful for the amnesia person where to look for his/her family.  

Those maps show concentrations of hydrogen-2(top) and    oxygen 18(bottom). Red represents the highest concentration, and blue represents the lowest concentration of each isotope.