Electrical engineering 13 Computer networking & communications 12 Media studies 11 Applied ecology 9 Sociology 9 Algorithms & data structures 8 Environmental science, engineering & technology 8 linguistics 8 Automatic control engineering 7 Central government policies 7 Computer science 7 International relations 7 Politics & government 7 Public health & preventive medicine 7 Robotics 7 Crime & criminology 6 Engineering: general 6 Environmental management 6 Information technology: general issues 6 Mathematical theory of computation 6 Political control & freedoms 6 Reliability engineering 6 Artificial intelligence 5 Communications engineering / telecommunications 5 Computer security 5 European history 5 Industrial applications of scientific research & technological innovation 5 Production engineering 5 Software Engineering 5 Agriculture & farming 4