LEE BERGER is the Reader in Human Evolution and the Public Understanding ofScience at the Institute for Human Evolution, School of GeoSciences, University ofthe Witwatersrand, Johannesburg South Africa. He won the National GeographicSociety's first Research and Exploration Prize in 1997, has conducted numeroussubsequent expeditions, and is best known for his discovery ofAustralopithecussediba. MARC ARONSON is an award-winning author and editor who earned hisdoctorate in American History at NYU, he is co-author ofThe World Made NewforNational Geographic, a new biography of Robert Kennedy, andRace- A HistoryBeyond Black and White.