Science Of Love GUESTS: JOHN GOTTMAN, Ph.D. Author, The Seven Principles for Making Marriage Work (Crown Publishing, 1999) Professor of Psychology at the University of Washington, Seattle, WA Director of the Gottman Institute in Seattle Studies have shown that happily married people are healthier than people in bad relationships or divorcees. So how do you keep your marriage healthy? Psychologist John Gottman offers marital advice, but unlike most relationship gurus, he actually has scientific research to back up his theories. Gottman has studied hundreds of couples in his Seattle-based Family Research Laboratory, dubbed the "love lab." Join Ray Suarez and John Gottman for a look at what makes a marriage last.