An anthropologist is a person who is actively involved in the study and practise of anthropology. Anthropology is the study of human characteristics in the context of historical and contemporary civilizations. Sociological anthropology, cultural anthropology, and philosophical anthropology are all fields that examine the norms and values of communities in different ways. Linguistic anthropology investigates how language influences social life, while economic anthropology investigates how humans behave in terms of money. Biological (physical), forensic, and medical anthropology are three branches of study that investigate the biological development of humans, the application of biological anthropology in a legal setting, and the study of diseases and their effects on humans over time, all of which are branches of science.