Sorry for the off-topic post, but I wanted to provide a quick correction. Mitochondrial Eve is not the most recent common ancestor, she was the most recent common matrilineal ancestor - the last ancestor we share in common counting only our mother's mother's mother's....etc. She would have predated the last common ancestor by many tens of thousands of years.
I as a fundamentalist Christian know that that is wrong. digress to chinese last names. Slowly, various last names have been dying out. If this trend keeps up, mathematically, they will end with only one last name. Imagine that a group of 1,000 men and 1,000 women survived the bottleneck of the Toba eruption. Then, periodically, one line of mitochondrial DNA died out. Lets say, every thousand years, half of the mitochondrial DNA lines disappeared. After 11,000 years, only one Mitochondrial DNA line would be left. Yet, all the other chromosomes from the rest of the 1,000 women would still be around. If we a truly came from just one woman at the time of Toba, we would have the genetic diversity of Cheetahs. Thus, we have a greater diversity of DNA than Cheetahs but less than a troop of Chimpanzees which did not suffer such a dramatic bottleneck. Yes, unfortunately for me, Mitochrondrial DNA does not prove that we are all descended from one woman who lived some 70,000 - 200,000 years ago depending on whose math you use.