Gao Fei, a teacher with Lanzhou Foreign Language Middle School, shows a bow he has reconstructed with a design of Northern Song Dynasty (960–1127) in Lanzhou City, the capital of Northwest China’s Gansu Province, July 28, 2016. Gao said he integrated knowledge of mathematics, physics and other subjects to recreate the lost bow, which can shoot an arrow capable of piercing through iron sheet 100 meters away. (Photo: China News Service/Yang Yanmin)
