At least one-third of the people we know are introverts. They are the ones who prefer listening to speaking; who innovate and create but dislike self-promotion; who favor working on their own over working in teams. It is to introverts—Rosa Parks, Chopin, Dr. Seuss, Steve Wozniak—that we owe many of the great contributions to society. Our lives are driven by a fact that most of us can't name and don't understand. It defines who our friends and lovers are, which careers we choose, and whether we blush when we're embarrassed. This title shows how the brain chemistry of introverts and extroverts differs, and how society misunderstands and undervalues introverts.