Apparently you believe a wave from Africa just quit ****ing other humans once it left Africa.
You really should get your facts straight.
As for your quote you really should read Out of Africa Again and Again.
http://www.sciencedaily.com/releases...0307074956.htmAnalyses of recently derived human genetic trees by Alan R. Templeton, Ph.D, of Washington University in St Louis, show that there were at least two major waves of human migration out of Africa. DNA evidence suggests also that these wanderers bred with the people they encountered, rather than replaced them, in a "make- love-not-war,"scenario.