DNA is not just an instruction book for the present and something to pass on to future generations -- it is also a record of our genetic past. No longer do researchers look for clues to human history merely in fossil bones and stone tools, they also seek "genetic fossils" in the DNA of living peoples. NPR's David Baron talks to University of Maryland researcher Sarah Tishkoff, who, by studying DNA and mitochondrial DNA, has revealed some of the most detailed clues yet to humankind's origins.
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