What argument could you give for or against the idea that body language is a science with principles that can be interpreted by specialists?

Communicative activity in a person's life is one of the most important roles. The ability to transfer voice messages separates humans from the natural world, but the remaining part of it is in that we have the unique ability to consciously and unconsciously read body language each other gestures, different poses, arbitrary and involuntary movements.  In recent years adopted a more highly specialized objects of body language study: the doctrine of hand gestures, facial gestures, gestures, head and legs, posture and gestures sign. All these units are non-verbal communication are combined in the concept of "gesture" - from the Latin. gestus, meaning to do, wear, bear responsibility, control, execute, etc. The well-known researcher of body language A. Kendon, exploring the evolution of the term, noted that in the Roman treatises on the behavior of speakers, such as Cicero and Quintilian  meaning of  "gesture" was defined as the rules for using the capabilities of a body, significant movements of the arms, legs, body and face, that makes the term  really close to the modern usage of it - an interactive sign everyday nonverbal human behavior. Body language, occupying an important position in the history of culture, is the subject of rhetoric, medicine, psychology, pedagogy, art, hirologii (language of lines and bumps hands) hironomii (manual arts of rhetoric) and physiognomy, the study of the manifestation of inner qualities in terms of human and expression on the face. Skillfully using the body language you can add and accentuate your speech and enrich your nonverbal communication with others, to make a person to trust you, to convince others of your sincerity and righteousness.