Duke University is a private research university in Durham, North Carolina. Duke is often ranked as one of the world's top 20 universities, and similarly, is often ranked top 10 in the United States. Several faculty members, affiliates and alumni have been awarded the Nobel Prize in recent years. Duke's campus spans over 8,600 acres (3,500 hectares) on three contiguous sub-campuses in Durham as well as a marine lab in Beaufort. 15 Nobel laureates and 3 Turing Award winners have been affiliated with the university. Duke alumni also include 50 Rhodes Scholars and 25 Churchill Scholars