The unspoken and sometimes hidden language of the human face. There's more in your face than just the eyes, nose and mouth with which you were born. Scientists are beginning to understand how facial expressions form a language of their own. Without realising it we may often be giving away our innermost thoughts and feelings. The face of a lover might briefly flash the hint of passion to come. Or the smile of a colleague that's just a little too quick may not be such a friendly gesture. The face may be used, and is used, for any and every human purpose - to dominate, to terrify, to harm, to please, to amuse ... the face is no different in this respect from speech. In this programme doctors and psychologists in Britain, the United States and Holland explain how we may read the meaning of facial expressions. Can we mask emotions? Does social background show in the face? How is the face used in courtship? And what is it in the face that can make it truly attractive? Written and produced by PETER JONES