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Larsen is one of the world's top researchers, and he is also a gifted teacher. These twin skills exhibit themselves on every page of Our Origins . In addition, the book is illustrated with state-of-the-art drawn figures and images from several of the world's leading photographers. The Second Edition has been thoroughly revised to stay abreast of developments in this fast-moving field-in particular, the significance of the Arbi discovery (announced in the fall of 2009) has been incorporated throughout.