J C D CLARK QUESTIONS EVEN WHETHER THERE ARE PROCESSES MUCH LESS PROGRESS IN HUMAN AFFAIRS IN HISTORY

https://www.youtube.com/watch?v=LQin6KDobhI 12 minutes in.

David Reich, in prehistoric genetics, admits that he really cannot distinguish two modern human source populations re mixture, as to whether one or the other, or both or neither, are modern humans or archaic humans. p 212.