"Out of Africa" in Question

The evolutionary “out of Africa” theory—which holds that humans evolved in Africa and split off on different evolutionary paths as they migrated away from that continent—has been given yet another jolt by new DNA studies which have called the dating behind the belief into question.… involves measurements of the rate at which children show DNA changes not seen in their parents—the so-called “mutation rate”… authors calculate the last common ancestor for human mitochondrial lineages to around 160,000 years ago.…