The Kellogg brothers, breakfast and 'wellness' pioneers

The Kellogg brothers transformed the American breakfast. They promoted revolutionary ideas we now consider central to wellness, and celebrities flocked to their famous sanitarium and spa in Battle Creek, Michigan. But their commercial success came at a heavy personal cost. William Brangham talks to Dr. Howard Markel about his new book, "The Kelloggs: The Battling Brothers of Battle Creek."