The city has an opera, a ballet, and the impressive national library. It is the seat of many learned societies, research organizations, and academies of fine arts, drama, dance, and music. The more than 25 institutions of higher learning include Beijing Univ., the People's Univ. of China, China Univ. of Science and Technology, Qinghua Univ., the Beijing Institute of Foreign Languages, two medical colleges, and many technical and scientific schools. The Beijing zoo is famous for its collection of pandas. The Workers' Stadium is the scene of the Pan-Chinese games, held every four years.