Nervous, pal?: A man in Greensboro, NC, being given a polygraph test in 1962 Credit: Jack Moebes/Corbis

Methods for detecting lies have been around for as long as people have been telling them. There is something comforting in the notion that even the most skilled liar will unconsciously betray himself by some subtle cue--a reddening of the ears, a fidgeting of the hands, an uncontrollable shift of the eyes. But attempts to turn the art of lie detection into a science have always been controversial.

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