Study and teaching Mathematics 39 History 34 English language 29 Physical education and training 27 Research 27 Language and languages 25 Social aspects 20 Education 17 Science 17 Culture 16 Art 15 History and criticism 14 Philosophy 13 Technological innovations 13 Training of 13 Computer-assisted instruction 12 Engineering 12 Foreign speakers 12 Educational technology 9 Methodology 9 African Americans 8 Curricula 8 Design 8 Political aspects 8 Second language acquisition 8 Data processing 7 Rhetoric 7 Sports 7 Business education 6