include economics, history, philosophy, law, foreign languages and literature, geography, physics, mathematics, chemistry, nuclear power, biology, and computer science. There are about 3,000 faculty members, including teaching and research staff. All facilities are located on a modern, high-rise campus in the northern part of Pyongyang. Other notable universities include Kim Chaek University of Technology and the University of Natural Science, which focuses on computer science and natural science related to mass nuclear research. Pyongyang University of Foreign Studies, trains working level diplomats and trade officials, and Kim Hyong Jik University of Education trains teachers. Choson Exchange, a non-profit organization founded by Harvard, Yale, Wharton School and Singaporean graduate students, also runs consulting and training programs in finance, business and economics with Kim Il Sung-university and the State Development Bank in North Korea. Their programs target North Koreans under the age of 40 and combine OpenCourseWare materials and on-site lectures to deliver year-round training. Pyongyang University of Science and Technology (PUST), which opened in 2010, is the country's only privately funded university. It is a joint venture institute of higher learning, founded, funded and operated by mostly Evangelical Christians from South Korea, China, and the United States. In recent years there have been more Europeans due to a US travel ban. The purpose of the university is to provide quality education with an international perspective. All teaching staff are foreign professors who teach in English, other than specific German and Chinese language classes. In 2019 it had 638 enrolled undergraduate and postgraduate students. In addition, the Pyongyang Business School(평양국제경영학교) offers short courses given by foreign lecturers. It was founded by the Swiss government and helps teach students business management. Another economic educational institution is the Centre for the Study of the Capitalist System, established in 2000. In July 2011, all universities in North Korea were closed after the Arab Spring caused the government to become concerned about the possibility of a similar popular uprising in North Korea. The remote universities obtained media attention while encrypting lesson plans and communicating them by a method of a radio broadcasting in 2016. International students Prior to the COVID-19 pandemic, there were estimated to be about 100 foreign students at Kim Il-Sung University and 100 at the Kim Hyong Jik University of Education, the majority of whom were Chinese. Compared to foreign tourists, international students in North Korea, while still under state control, are granted