A leading neuroscientist offers a history of the evolution of the brain from unicellular organisms to the complexity of animals and human beings todayRenowned neuroscientist Joseph LeDoux digs into the natural history of life on earth to provide a new perspective on the similarities between us and our ancestors in deep time. This page-turning survey of the whole of terrestrial evolution sheds new light on how nervous systems evolved in animals, how the brain developed, and what it means to be human.