Study and teaching Mathematics 228 English language 199 History 168 Physical education and training 118 Science 98 Research 78 Language and languages 76 Art 72 Culture 72 Education 71 Foreign speakers 66 Social aspects 60 Training of 59 Design 49 Philosophy 46 Technology 41 Geography 38 Rhetoric 36 English literature 35 Curricula 33 Computer-assisted instruction 31 Data processing 31 Management 31 Engineering 30 Sports 29 Methodology 26 Architecture 25 History and criticism 25 Psychological aspects 25