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Johanson (Lucy: The Beginnings of Humankind), the paleoanthropologist who in 1974 discovered the famed 3.2-million-year-old hominid named Lucy, and Scientific American editor Wong delve deeply into the significance of Lucy, her probable ancestors and her probable successors, including modern humans. The authors capture the curiosity, passion and excitement that Johanson and his colleagues bring to their research, as well as the mundane, backbreaking aspects of fieldwork. Wong and Johanson are also expert at framing the science that informs judgments about what defines a hominid species, such as brain size, the ability to walk upright and facial structure. They probe the equally important question of what drove human evolution, examining three major approaches: a social model, a dietary model and an environmental model. Johanson is adept at framing the debates within his famously contentious discipline, ranging from fundamental questions about the fossil record to theories of early human migration, the fate of the Neanderthals and the controversy over the highly publicized recent discovery of fossil "hobbits" on the Indonesian archipelago. The writing is accessible, especially considering the challenging nature of the science that shapes our understanding of human evolution. (Mar.)Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.