History 172 Science 128 Mathematics 75 Study and teaching 66 Research 54 Science and state 53 Botany 38 more ... Physicists 35 Geology 34 Social aspects 33 Scientists 31 Government policy 30 Women in science 29 Birds 25 Natural history 25 Naturalists 24 Study and teaching (Higher) 24 Women scientists 24 Trees 19 Nature conservation 18 Technology and state 18 Identification 17 Astronomers 16 Climatic changes 15 Study and teaching (Elementary) 15 Study and teaching (Secondary) 15 Education 14 Physics 14 Atomic bomb 13 Biology 13 less ...