Introversion meets truthiness! Susan Cain, the author of Quiet: The Power of Introverts in a World That Can’t Stop Talking, will visit the Colbert Report this Thursday. An instant New York Times bestseller, Cain’s book examines the important but undervalued contributions of introverts, who make up a third of our population. Cain is an introvert herself. Stephen Colbert—or at least the “Colbert” character—is one of America’s more famous extroverts.