It seems to me, that the "theory" of all people on this earth originated from Africa is not a foreign to most of us, but I did not know that up to date, scientists already have concrete evidences, such as DNA, to prove this "theory". Journey of Man: A Genetic Odyssey, a documentary movie based on book with the same name (published in 2002. How behind I am!) written by Spencer Wells (an archeologist and geneticist), has advanced investigation on this subject. After his comprehensive researches Wells reached an absolutely certain conclusion with (DNA) evidences that we human, all came from Africa.
No wonder I have such fascination with Africa!
Thank Wells for the brilliant job. I am not a professional historian but I consider this finding a milestone in history study.
Of course, still, this discovery only reveals our physical origin, that much more mysterious question - where is our "spirit" (I am not satisfied with biological answer such as "brain function") come from - is still out there.