"Words express thoughts...Body expresses emotions" Well Every interaction in civilized world is multilayered. You have to constantly play the guessing-game for intents and motives - "Does he really mean what he says"? "Does she really feel how she emotes"? "Does he really believe in how he acts"? This makes observing nonverbal behavior immensely important, as that is what helps you develop an understanding into people's emotional realities. "Observing Nonverbal Behavior - An exhaustive guide to the essential skill of 'Social Intelligence'," with more than 200 photographs and reader-friendly style, rises way above run-of-the-mill 'How to' books on body-language and delineates the science behind the subject while simplifying it for utility.