From a leading neuroscience researcher, an exploration of the neural basis of optimism, and how the brain simulates the future. How does the brain generate hope? How does it trick us into moving forward? What happens when it fails? How do the brains of optimists differ from those of pessimists? Psychologists have long been aware that most people tend to entertain an irrationally positive outlook on their lives. Optimism may be so crucial to our existence that it is hard-wired into our brains. With the emergence of MRI brain imaging, we are beginning to understand the neural mechanisms and to understand the biological basis of optimism, and how our optimistic illusions affect our financial, professional and emotional decisions.