This could potentially be used to answer some historical questions about invasions. For example, in the Balkans, how much do the Slavic-speaking areas differ from the Greek, Albanian, or Romanian-speaking areas? That could help determine whether the Slavs settled en masse or just imposed their language on a pre-existing population, the way the Romans did in Spain.
"Scientists studying the DNA of 52 human groups from around the world have concluded that people belong to five principal groups corresponding to the major geographical regions of the world: Africa, Europe, Asia, Melanesia and the Americas."
Wonder if the Mayans and American Indians fall into the Egyptian grouping?