Geneticists have discovered new proof of the great diversity among African people and unearthed an interesting finding in the DNA of one of South Africa's leading citizens, the Archbishop Desmond Tutu.

They discovered that any two Bushmen who spoke different languages were more different genetically than a European and an Asian.

The Bushmen were more genetically distinct even if they lived in close proximity, according to the new groundbreaking study, which appears this week in the science journal Nature.

Modern humans evolved on the African continent about 200,000 years ago and have lived there longer than any other place in the world.

The study focused on genomes, a complete collection of a person's DNA, and examined those of a Kalahari Desert bushman and of Tutu, who won the 1984 Nobel Prize and is the former head of the Anglican Church of South Africa.

Tutu's DNA was studied as Bantu, a farming people, while the Bushmen represent a hunter-gatherer culture. Researchers found that Tutu's ancestry includes at least one Bushwoman.

In recent years, DNA tests to determine one's ancestry have gained popularity in the African American community, but some critics have blasted the current testing as wildly inaccurate.