Clark University is an American private university and liberal arts college in Worcester, Massachusetts. Founded in 1887, it is the oldest educational institution founded as an all-graduate university in the United States. Clark now also educates undergraduates. The U.S. News & World Report ranked Clark 75th nationally in both 2015 and 2014, 83rd in 2013, and 95th in 2012. In 2013, Forbes ranked Clark University #51 in research. The acceptance rate of the undergraduate class in 2014 was 54%. It is best known for being the birthplace of rocket propulsion.