By 2000, the city's 60 national research institutes and two national universities had been grouped into five zones: higher education and training, construction research, physical science and engineering research, biological and agricultural research, and common (public) facilities. These zones were surrounded by more than 240 private research facilities. Among the most prominent institutions are the University of Tsukuba (1973; formerly Tokyo University of Education); the High Energy Accelerator Research Organization (KEK); the Electrotechnical Laboratory; the Mechanical Engineering Laboratory; and the National Institute of Materials and Chemical Research. The city has an international flair, with about 7,500 foreign students and researchers from as many as 133 countries living in Tsukuba at any one time.