I guess the original thread was in CC because I don't find it here. But the crux of it was that the stardust didn't just fall into a single puddle of muck on the face of the Earth. Species were springing up everywhere. It's certainly been proven that the viral strain from Africa spread further than any other. But plumes of similar enough species where also spreading, all over the Earth. When the plume from Africa met with a compatible enough plume close by they mingled. The resultant species is not the same as the species out of Africa. And it is this new species that mingled with its other neighboring plumes. Geography is not what changed the "people" out of africa; mingling with the other species did.


http://www.pbs.org/first-peoples/home/


I don't remember many of you agreeing with me back in the original thread.