In a newly released book Mapping Human History: Discovering the Past Through pour Genes, US science writer Steve Olson has attempted to explain how all the world's genes funnel back to one common African maternal ancestor 200k years ago and one common father 50k years later. This common father's Y genes form the basis of every male alive today. No these two are not called adam and Eve. But the two African "originals" are those whose lineage has never faltered according to Olson's research. Everyone on this earth is African if you want to trace back far enough. By knowing this lineage it is possible to find points of mutation where variety from the original commenced. The crunch is that eventually the current genetic differences will be blended and there will be a reversal of the dispersion of the genetic pool that has been occuring since the origin in Africa. The greater the numbers of immigrants, the more homogenised the genetic pool becomes. Isn't that happening already?