I'm guessing that avid readers tend even more toward introversion than other groups, yet I noticed that even my reading choices are influenced by our cultural bias toward extroversion. Susan Cain lifts the curtain and exposes this bias, and explores the alternatives. Some science is referenced, but I think Cain is wise to avoid being mired in psychological debates and keep a pragmatic focus. The real revelation has more to do with how I can behave naturally and still navigate my cultural environment, a valuable perspective.