Where did we come from? For anthropologists like Milford Wolpoff of theUniversity of Michigan, that question provokes contentious scientificdebate. One side believes Homo sapiensdescended from a single female "Eve" whose progeny spread around theglobe, replacing more archaic species, some 100,000 years ago. Wolpoffand others take the opposing view that humanity emerged as much as 2million years ago in many places as people colonized the world andgradually evolved to their modern state. Wolpoff discussed thelingering debate with Discover associate editor Kathy A. Svitil.