The National Science Foundation (NSF) is a United States government agency where discoveries begin and supports fundamental research and education in all the non-medical fields of science and engineering. Its medical counterpart is the National Institutes of Health. With an annual budget of about US$6.87 billion (fiscal year 2010), the NSF funds approximately 20 percent of all federally supported basic research conducted by the United States' colleges and universities. In some fields, such as mathematics, computer science, economics and the social sciences, the NSF is the major source of federal backing.