Why do we think some people are beautiful? Why do orgasms feel good? Why do we get angry? Anxious? In this intriguing book, biopsychologist Victor Johnston explores the origins of human emotions. Drawing on computer science, neurobiology, and evolutionary psychology, he shows us that emotions are not some strange accident of nature, but are instead the basis of learning and reasoning, and help us to adapt to a complex, rapidly changing environment. In the process, he offers a radical new view of reality: What we see, hear, smell, feel—even what we consider beautiful—is not an accurate representation of the world around us; rather, our feelings are illusions, shaped by millions of years of evolution. In clear and colorful prose, Johnston helps us navigate the intimate relationship between our private conscious feelings and our biological survival—and tells us what this means for human creativity, innovation, and free will.