This revolutionary book provides fresh answers to long-standing questions of human origins and consciousness. Drawing on his breakthrough research in comparative neuroscience, Terrence Deacon offers a wealth of insights into the significance of symbolic thinking: from the co-evolutionary exchange between language and brains over two million years of hominid evolution to the ethical repercussions that followed man's newfound access to other people's thoughts and emotions.This superb and innovative look at the evolution of language could only have been written by one person . . . Terrence Deacon. An extraordinary achievement!Essential reading for anyone interested in what makes us human. A work of enormous breadth, likely to pleasantly surprise both general readers and experts.