"Foster tells Lightman that she can hear from his voice that Miller is smiling. It is not only the inflection that reveals the smile, but the smiling lips change the length of the vocal channel from which sounds are emitted. Many advertisers use announcers who sound as if they are smiling, because we like to hear that sound...."

Read Paul Ekman's comments on other events in each week's show in his weekly column;

"The Truth About Lie to Me", by clicking here.