I came across this book whilst browsing in a bookstore - and I couldn't put it down. Although small, it's packed with fascinating insights on the five key factors of personality (i.e., Extraversion, Neuroticism, Conscientiousness, Agreeableness, and Openness to Experience), which psychologists have found make up the core aspects of our temperament. I studied psychology, and this book provides the best description of Extraversion and Neuroticism that I have ever read. It is easy to read, and packed with scientific information on the heritability of personality, and the fascinating case studies demonstrate how each facet of personality has affected men and women's lives. I was surprised to read that Extraverts tend to have a higher sex drive, greater need for travel, money and status (so it's not all about sociability!). This is because extraverts' brains are wired to be 'rewarded' by such things, but these are less 'rewarding' for introverts. And people high in Neuroticism, may have a propensity to depression (which is good to know). A bonus is that each chapter provides examples of how the factors inter-relate within a person, e.g., how a person with high extraversion, but with low agreeability, might not be a pleasant party companion! In summary, this book provided me with some great new insights into understanding myself and others, and would make a wonderful gift for someone.