Much of Zimbabwe's research effort is directed at improvements in agriculture. The government's budget for agricultural research is administered by the Agricultural Research Council which is headquartered in Harare and operates seven research institutes, eight research and experiment stations, and the National Herbarium and Botanic Garden. In Harare, at the Blair Research Laboratory, simple, innovative technologies are being developed to improve Zimbabwe's water supply and sewage disposal. Other research organizations, all in Harare, include the Geological Survey of Zimbabwe, the Institute of Mining and Metallurgy, and the Public Health Laboratory. The National University of Science and Technology, founded in 1990 at Bulawayo, has faculties of industrial technology and applied sciences. The University of Zimbabwe, founded in 1955 at Harare, has faculties of agriculture, engineering, medicine, science, and veterinary science. Degrees in agriculture and polytechnic studies are offered by seven colleges. In 1987–97, science and engineering students accounted for 24% of college and university enrollments.