Politics & government 28 Education 20 linguistics 19 Sociology 18 Society & social sciences 17 Materials science 13 Science: general issues 13 Anthropology 12 Western philosophy, from c 1900 - 11 Climate change 10 Environmental science, engineering & technology 10 Gender studies, gender groups 10 History 10 Literary studies: general 10 Media studies 10 Philosophy: aesthetics 10 Physics 10 Psychology 10 Economics 9 International relations 9 Literature: history & criticism 9 Biology, life sciences 8 Central government policies 8 Cultural studies 8 Electrical engineering 8 Biomedical engineering 7 Computer networking & communications 7 Economic theory & philosophy 7 Environmental management 7 Mathematics 7