Gene studies confirm "out of Africa" theories By Maggie Fox, Health and Science Editor WASHINGTON (Reuters) - Two big genetic studies confirm theories that modern humans evolved in Africa and then migrated through Europe and Asia to reach the Pacific and Americas. The two studies also show that Africans have the most diverse DNA, and the fewest potentially harmful genetic mutations. One of the studies shows European-Americans have more small mutations, while the others show Native Americans, Polynesians and others who populated Australia and Oceania have more big genetic changes. The studies, published in the journal Nature on Wednesday, paint...