Study and teaching 50 Education 40 Training of 20 Teachers 18 Study and teaching (Higher) 8 Environmental education 6 Teaching 5 Universities and colleges 5 Curricula 4 Graduate work 4 Religious education 4 Study and teaching (Primary) 4 Study and teaching (Secondary) 4 Congresses 3 Consumer education 3 Movement education 3 Multicultural education 3 Physical education for children 3 Drama in education 2 Health education 2 In-service training 2 Outdoor education 2 Periodicals 2 Science 2 Special education 2 Study and teaching (Preschool) 2 Technical education 2 Activity programs 1 Administration 1 Adult learning 1