Recently, researches at the University of Pennsylvania have discovered that the African San people are the most ancient race in the world. According to the study, the genetic DNA of the San people was more diverse than any other group and their ancestors had migrated from the continent to spread their DNA throughout the world. Scott Williams, investigator in the Vanderbilt Center for Human Genetics Research, claimed that “as one moves away from Africa, genetic diversity declines rather dramatically” . Likewise, “as human beings spread out into isolated communities, [language] stresses and peculiarities develop”.
BBC webpage reports that “a large amount of the group's data comes from populations that have never previously been studied genetically. This allows the map to provide an entirely new link between biology, and existing anthropology and linguistic information”. This linguistic information is possible due to the fact that it was identified the same language features spoken by San people in other East African languages. A research conducted in 2003 indicated the San language might be the key to explain human language origin.