[Sabertooth]

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.

Just an fyi.

[FITZ]

corresponding to the major geographical regions of the world: Africa, Europe, Asia, Melanesia and the Americas

But even then ---they have to pick an arbitrary point in time because for example look at all those regions now aren't what they were 10,000 years ago and 1,000,000 years ago they weren't the same as they were 10,000 years ago or 100,000 years ago.