Inventions 303 Inventors 300 inventors 298 Technological innovations 269 Exploration 209 Study and teaching 188 History 176 more ... Exploration of outer space 154 Computer science 112 Research 101 Travel 81 Animals 76 Description and travel 73 Planets 73 Education 72 Behavior 70 Man-woman relationships 70 Electronic data processing 54 Wildlife management 53 Wildlife rescue 53 computer science 53 data processing 53 Science 52 Teachers 50 Wildlife rehabilitation 45 Psychological aspects 43 Mathematics 40 Training of 40 Social life and customs 35 Teaching 35 less ...