I don't think science would say that at all. It's simply that most of us have "intertwined lineages" due to the antics of past generations. Those formal portraits in the history books don't begin to convey all the shenanigans that went on. Think Thomas Jefferson, a true intellectual giant, and his good friend, Sally Hemmings.

Apparently, we are all six billion of us descended from a population of around 2000 in S Africa. 2000? That's about the size of a large voting precinct here in my county.