Quiet: The Power of Introverts in a World That Can't Stop Talking by Susan Cain - Book Summary This book is powerful in its own way, as it gives a voice to the introverts of this world. That is very significant because as many as one-third to half the people in the world are introverts. Introvert refers to the people who prefer listening to speaking, reading to partying; who invent and create but are not likely to present their ideas; who are more...