What your body knows about happiness : how to use your body to change your mind

"In school, we're taught that the central nervous system, including the brain, is the big computer telling our bodies how to respond to a trigger. But there's a growing body of research proving that in fact the system often works in reverse, that it's our body programming the brain by acting without being told what to do. For example, the act of smiling can improve your mood. Or when you pass a dark alley and your body tenses and your heart start...