Arizona State University (commonly referred to as ASU or Arizona State) is a national space-grant institution and public metropolitan research university located on several campuses spread across the Phoenix, Arizona Metropolitan Area.[9] It is the largest public university in the United States by enrollment.[10] Founded in 1885 as The Arizona Territorial Normal School at Tempe, the school came under control of the Arizona Board of Regents in 1945 and was renamed Arizona State College.[11] A 1958 statewide ballot measure gave the university its present name. In 1994 ASU was classified as a Research I institute; thus, making Arizona State one of the newest major research universities (public or private) in the nation.[12][13][14] Arizona State's mission is to create a model of the “New American University” whose efficacy is measured “by those it includes and how they succeed, not by those it excludes”.[15][16] Currently, Arizona State University ranks as Top 25 research institutes in the U.S. in terms of research output, innovation, development, research expenditures, number of awarded patents, and awarded research grant proposals.[17] Arizona State University's faculty have achieved a number of awards, and includes two Nobel laureates (as of 2012). Arizona State University is also home to the world’s most advanced transmission electron microscope TEM.[18]