The U.S. surgeon general has issued a new advisory on the growing epidemic of loneliness, something that is affecting about half of American adults. According to Dr Vivek Murphy, being disconnected from others is comparable to smoking 15 cigarettes a day – and can lead to premature death. Soledad O’Brien speaks with the lead researcher on the advisory report, Dr. Julianne Holt-Lunstad, Ph.D. She’s a professor of psychology and neuroscience at Brigham Young University.