But why should we be surprised by this?:
Ancient human populations in Africa probably mixed far more than we previously thought. That is just one of the revelations about our genetic history that has been uncovered by sequencing the genomes of people from populations previously underrepresented in human genetic studies.
“We identified a lot of genetic variation that had not been found before,” says Anders Bergstrom at the Wellcome Sanger Institute in Cambridge, UK.Layal Liverpool, “DNA analysis reveals just how intertwined ancient human lineages are” at New Scientist
Those people probably didn’t know that they were supposed to organize their lives for the convenience of future researchers. 😉