[Noumenon]

The Science authors concluded that 95 percent of the genetic variations in the human genome is found in people all over the world, as might be expected for a small ancestral population that dispersed perhaps as recently as 50,000 years ago.

Interesting side note - some recent studies suggest that there was a 'bottleneck' in human genetic diversity that occurred around 70,000 - 75,000 years ago. The implication of such a bottleneck is that the population was drastically reduced by some event or circumstance. That time perios happens to coincide with the eruiption of a supervolcano near New Zealand known as Tova.

[blam]

"That time perios happens to coincide with the eruiption of a supervolcano near New Zealand known as Tova."

That was Toba in Sumatra. I've seen estimates that only 5,000 people worldwide survived this incident.