Ever wondered what Mona Lisa’s enigmatic smile was really about?

Or perhaps it was the smile worn by a certain IRS agent, mortgage bank officer, your best frenemy or your mother-in-law that you found unnerving or inscrutable. Dr. Cochran talks with Dr. Marianne LaFrance, Professor of Psychology at Yale University and author of, Lip Service, Smiles In Life, Death, Trust, Lies, Work, Memory, Sex and Politics, and all is revealed.