[Physicist]

If the Liujiang dates were confirmed, out-of-Africa adherents would need to find older African H. sapiens fossils than they now have or show that modern humans migrated extremely quickly from Africa to eastern Asia.

But humans are obviously capable of migrating extremely quickly. It's entirely possible for a nomadic group of humans to travel from Africa to eastern Siberia and back again by way of Scandanavia in far less than a single human lifetime; all that's needed is the desire to do it. To me, it seems highly unlikely for some long-distance travel not to have happened.

Of course, this neither supports nor refutes the "Out-of-Africa" hypothesis. What it means is that some of the most important migrations may well have happened too quickly to have left any trace. "Out-of-Africa" and "evolved everywhere" may be indistinguishable. It might as easily have been "Out-of-India".

[Right Wing Professor]

The key question, though, is where and when the evolutionary bottleneck occured. Any model of geographically separated but commingling populations has to be consistent with the genetic data, which has been interpreted in terms of a very small number of humans, and a single maternal ancestor, at some time in the period 50,000 - 100,000 B.C..