University in Xi'an teaches students to play marble games

Students learn to play with marbles during a course at Xi'an Physical Education University, on November 14, 2017. The marbles game is actually a sport with a set of rules and requires teamwork to win. The game is currently the smallest ball game in the world and it was officially recognized as a formal sport by the General Administration of Sport in 2003. [Photo: Chinanews.com]