The document summarizes research on universal patterns of culture from several researchers. Wissler identified 11 broad areas of universal culture in 1923. Murdock expanded on this in 1945, listing around 88 common cultural elements across societies. Durkheim then initiated three techniques for comparative cultural studies in 1947: comparative analysis, studying specific cultural differences, and specific cultural similarities. The document then discusses four key factors that can account for cultural diversity: cultural variability, cultural relativity, environmental differences, and human ingenuity and ability to adopt new cultures.