Thanks.
This subject is covered in (exhausting) detail in Oppenheimer's excellent book: Out Of Eden. I also read his book Eden In The East, another good one.
Eden in the East:
The Drowned Continent
of Southeast Asia
by Stephen Oppenheimer
HardcoverOut of Eden
by Stephen OppenheimerThe Real Eve:
Modern Man's Journey
Out of Africa
by Stephen Oppenheimer