Children greet 2018 National Science Day across China

Children have a close contact with silkworms during a sericulture-related knowledge promotion activity at Beipei District in Chongqing Municipality, southwest China, Sept. 15, 2018. Various activities are scheduled to be held from Sept. 15 to Sept. 21 across China to greet the 2018 National Science Day held each year. (Xinhua/Qin Tingfu)