In the first account of a flood of new research findings, an acclaimed New York Times science reporter tells the dramatic story of the lost ages of human history. In just the last few years an explosion of discoveries - driven by information from the human genome - has empowered researchers to address many long-standing questions about the deep human past. Nicholas Wade has drawn on the new findings to present the first portrait of a special and hitherto mysterious group of human ancestors - the ancestral human population that lived in Africa 50,000 years ago and from whom everyone in the world today is descended.