A recent scientific study finds that peopole with blue eyes can trace their ancestry to one person 6,000 to 10,000 years ago. The first case of blue eyes would have been the genetic mutation in a single person, probably somewhere in the Caucasus, and that mutation would have been passed on to the rest of us who have blue eyes. Thus, a person from Denmark, Jordan, or the U.S. with blue eyes all share a common ancestor.
According to John Hawks of the University of Wisconsin-Madison, “The question really is, ‘Why did we go from having nobody on Earth with blue eyes 10,000 years ago to having 20 or 40 percent of Europeans having blue eyes now? . . . This gene does something good for people. It makes them have more kids.”