I was interested in reviewing Susan Cain's (2013) "Quiet: The Power of Introverts in a World That Can't Stop Talking" for two reasons. First, as an introvert I wanted to learn more about myself. Second, I wanted to explore Cain and others' criticism that group activities in the workplace and in education are unfair to introverts. This book review contains two parts. The first part elaborates the general concept of introversion, borrowing heavily from the impressive amount of research and practical experience presented in Cain (2013). The second part addresses the criticism that teachers who use Cooperative Learning (CL) are being unfair to their introvert students. Links to "Online Instruments Measuring Introversion/Extroversion" are appended.