Many international students return home, but others remain, going on to earn advanced degrees and to work in the United States. Foreign students earn more than half of all engineering, computer science and physics doctorates awarded by American universities, and two-thirds of foreign citizens who receive science and engineering doctorates from American universities stay in the United States. These graduates increase our nation's brainpower, productivity and creativity. A third of U.S. Nobel Prize winners are foreign born. Among engineering and technology companies, a quarter had at least one key founder who was an immigrant, and more than half of those foreign-born entrepreneurs first came to the United States for an education.