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    History and prehistory; that said, this such a good answer that I can't bring myself to cavil about a difference of a few tens of thousands of years.
    – MCW
    Commented Mar 25, 2016 at 18:56
  • I remember hearing about this. But wasn't that just for one line? IIRC, you get very different findings when you check the Y Chromosome (inherited only from father to son) and Mitochondrial DNA (inherited only from the maternal line).
    – T.E.D.
    Commented Mar 26, 2016 at 15:45
  • 4
    I'm pretty sure that volcanoes going off is a natural thing. On the other hand, the question classes disease as non-natural so who knows? Commented Mar 27, 2016 at 23:10
  • Recent criticism about this theory: bbc.com/news/science-environment-22355515
    – Evargalo
    Commented Feb 28, 2019 at 13:10