Two weeks before his death, Oliver Sacks outlined the content of "The River of Consciousness," the last book he would oversee. The bestselling author of "On the Move," "Musicophilia," and "The Man Who Mistook His Wife for a Hat" is known for his insightful case studies of people with neurological disorders at the outer limits of human experience. However, his understanding of science was not limited to neuroscience or medicine; he was fascinated by the themes, ideas, and questions of all sciences. This comprehensive expertise and passion shape the perspective of this book, in which he questions the nature not only of human experiences but of all life. In "The River of Consciousness," Dr. Sacks explores evolution, botany, chemistry, medicine, neuroscience, and the arts, drawing on his great scientific and creative heroes—most notably Darwin, Freud, and William James.