History 20 Philosophy 11 Psychology 10 Research 8 Political aspects 7 Social aspects 7 Mathematics 6 Social sciences 6 Politics and government 5 Postcolonialism 5 Sex role 5 Social conditions 5 Capitalism 4 Economics 4 Equality 4 Feminist theory 4 History and criticism 4 Leadership 4 Management 4 Mass media 4 Methodology 4 Race 4 Relations 4 Science 4 Approximation theory 3 Belief and doubt 3 Biology 3 Communication 3 Comparative government 3 Contradiction 3