A record number of U.S. students received doctorates in 2012, according to new data from the National Science Foundation. For the first time, the number of doctoral recipients broke 50,000, with a final tally of 51,008. Total doctorates awarded grew by 4.3 percent over the previous year, the largest increase since 2007 and a significant improvement from the previous four years in which the numbers remains fairly steady. The NSF data shows large increases for doctorates in STEM areas, including life sciences, physical sciences and engineering between 2002 and 2012, and little growth in other major fields, including the social sciences, education and humanities.