Student from Xidian University shows his design that applies VR technology to liver cancer operation. [Photo by Liu Xuan/China Daily]

In response to saving energy and environmental protection, the other two themes, participants showed their wisdom in solving problems.

To go across the finish line of intelligent transportation, participants could only use mobile phones to control the device equipped with tracking and sensor capabilities without seeing the court. The task of energy utilization required devices to go against the wind with 60kg load, 20kg more than in the semi-final. In order to finish the mission of security protection, students could only use glue and battens the size of a pencil to design a bridge that might bear a strike at different magnitudes.

Named "Solve for Tomorrow", this fourth consecutive year of the contest not only focused on promoting the development of technology among the youth, but also wanted to give back to society by building bridges for students in rural areas, which was inspired by the mission of security protection. The champion team of last year's security protection will represent others to go to the mountain area in Zunyi, Guizhou province, and build a real bridge for local students to cross on their way to school.

After a day of intense competition, six teams from both high school groups and university groups were respectively awarded. The winners will also have the chance to visit Germany to explore advanced techniques.

The China Science and Technology Museum will collect and display students' outstanding works, according to Pang Xiaodong, vice curator of the museum. "We will also set an arena for anyone who wants to challenge the puzzles we give," Pang said. "We think this will be a good way to popularize science and attract more people, especially the young ones, to get involved in this field."