N'Djamena has an institute for cotton research, founded in 1939. The University of N'Djamena, founded in 1971, has faculties of sciences and of medicine and health. In 1987–97, science and engineering students accounted for 14% of college and university enrollments. There is a national telecommunications school in Sarh. Most research in Chad is dependent on foreign scientists and technicians; however, many foreign personnel were evacuated during the fighting of the early 1980s.