The paleoanthropologist Lee Rogers Berger has supervised archeological expeditions across South Africa, in Zimbabwe, and on the islands of the Micronesian archipelago. In 1997, he received the first National Geographic Society Prize for Research and Exploration for his studies of human evolution. He is best known for his 2008 discovery of Australopithecus sediba, a previously unknown species of hominid. His nine-year-old son Matthew found the first fragments of sediba in a cave outside Johannesburg. The site eventually yielded the two million-year-old remains of a young boy, an...