Excerpt: As optimistic as Americans tend to be, those who get caught in one of the health-care system's costly gaps often are shocked to discover how fast even a comfortable, middle-class life can slip away. That's the common thread in author Jonathan Cohn's new book 'Sick: The Untold Story of America's Health Care Crisis -- and the People Who Pay the Price.' It examines health and insurance predicaments that sneaked up on working Americans and frequently left them destitute or worse.  MORE >>