Clinical Anthropology is the study of healing systems around the world and the use of these systems, processes, and techniques in clinical settings. Clinical Anthropologists looks at systems, physical as well psychological and social, using an information model. Systems break down when information is inadequate, for example when you are deficient is some essential nutrient or when trying to determine the best course of action to stop a terrorist attack. Information can be lost from a system, as in blood loss, or the death of the shaman who knew where to find the mushrooms. Then there is information intrusion as when attacked by a virus, or when new ideas (evolution), world views, and technology (AK-47s and IEDs) enter Third World countries.