Deception is a central feature of everyday life. We hear it not only from Presidents ("I did not have sexual relations with that woman"), the dean of admissions of M.I.T. ("I have three college degrees"), or the sleazy sales associate at the local car dealership ("This SUV gets terrific mileage!"); we also hear lies from the people we meet and interact with on a daily basis, including our family, friends, colleagues-and yes, the woman ahead of us in line at Starbucks.

The issue confronting us is not whether people lie to us-they do-but how much and why. Just as importantly, we need to consider why we're so prone to believe the deception we hear from others, as well as the lies we tell ourselves. Finally, we need to explore why we view certain lies as harmless, while rejecting others as manipulative and shameful. Robert Feldman has unique knowledge of how deeply dishonesty is engrained in our everyday lives and broader culture.