Duke University is a private research university located in Durham, North Carolina. Duke's campus spans over 8,600 acres (3,500 hectares) on three contiguous campuses in Durham as well as a marine lab in Beaufort. Duke is often ranked among the best universities in the world by numerous university rankings. Duke's research expenditures in the 2015 fiscal year were $1.037 billion, the seventh largest in the nation. In 2014, Thomson Reuters named 32 of Duke's professors to its list of Highly Cited Researchers, making it fourth globally in terms of primary affiliations. Duke also ranks fifth among national universities to have produced Rhodes, Marshall, Truman, Goldwater, and Udall Scholars. Ten Nobel laureates and three Turing Award winners are affiliated with the university.