Philosophy 18 History 10 Politics and government 9 Social aspects 9 Ethics 8 History and criticism 7 Home Science 7 Social conditions 7 Social sciences 6 Women 6 Biology 5 Evolution-- Life Science 5 Interpersonal relations 5 Life 5 Agricultural Entomology 4 Climatic changes 4 Community Science 4 Economic conditions 4 English language 4 Equality 4 Evolution 4 Evolution (Biology) 4 Mass media 4 Orthogenesis 4 Processing Technology 4 Psychoanalysis 4 Research 4 Self-realization 4 Social life and customs 4 Vertebrates 4