Admit it: You've lied. You told a friend that his shirt looked stylish when you actually thought it was tacky and garish. Or maybe you said to your boss that her presentations were fascinating when in fact they were insipidly mindless. Or perhaps you told your landlord that the rent check was in the mail.
Don't feel bad. You're in good, dishonest company. A growing body of research shows that people lie constantly, that deception is pervasive in everyday life. One study found that people tell two to three lies every 10 minutes, and even conservative estimates indicate that we lie at least once a day. Such incessant prevarication might be a necessary social evil, and researchers have recently discovered that some fibbing might actually be good for you. "We use lies to grease the wheels of social discourse," says University of Massachusetts psychologist Robert Feldman. "It's socially useful to tell...