http://www.rand.org/news/press/2008/06/12/
U.S. Still Leads the World in Science and Technology; Nation Benefits From Foreign Scientists, Engineers.
Despite perceptions that the nation is losing its competitive edge, the United States remains the dominant leader in science and technology worldwide, according to a RAND Corporation study issued today.
The United States accounts for 40 percent of the total world’s spending on scientific research and development, employs 70 percent of the world’s Nobel Prize winners and is home to three-quarters of the world’s top 40 universities.