In a general sense, the whole way of life of man as a species. In a more specific usage, it is the learned behavior, social customs, ideas, and technology characteristic of a certain people or civilization at a particular time or over a period of time (such as Eskimo culture). In this sense, a culture is a group of people whose total activities define what they represent and are transmitted to others in the group by social (mainly linguistic) - as opposed to genetic - means. Culture includes the production of ideas, artifacts, and institutions. In a more restricted sense (as in the term 'blade culture') culture signifies the artifacts or tool- and implement-making tradition of a people or a stage of development. Similar or related assemblages found in several sites within a defined area during the same time period, considered to represent the activities of one specific group of people is a culture. Cultures are often named for a particular site or an artifact. The word 'culture' in archaeology means a collection of archaeologically observable data; it is defined as the regularly occurring assemblage of associated artifacts and practices, such as pottery, house-types, metalwork, and burial rites, and regarded in this sense as the physical expression of a particular social group. This usage is especially associated with Gordon Childe, who popularized this concept as a means of analyzing prehistoric material. Thus the Bandkeramik culture of Neolithic Europe is an hypothesized social group characterized by its use of a particular type of pottery, houses, etc. The term, in reference to the specific elements of material culture, is most often used in the Old World.