Thanks for the info, samwik. I've been reading about the 'YTT' Event. It is an intriguing suggestion that at least some of the earlier human migrant communities could have been eliminated. Whether or not it stands up to future research remains to be seen. Very interesting. I noticed in that earlier thread, "Neaderthal DNA...", good support for its placement in NQSci! (Keep up the good work Dr. Dawkins)

"Time is what prevents everything from happening at once" - John Wheeler