Children experience self-made kaleidoscopes during a science class at Wuying, a village of Miao ethnic group under joint administration by Rongshui County in Guangxi Zhuang Autonomous Region and its neighbouring Congjiang County of Guizhou Province, southwest China, Aug. 10, 2019. More than 30 student volunteers from south China's Macao offered a week-long teaching service for children in this remote village. Volunteers prepared various classes including painting, acting, science and PE to enrich local children's summer vacation and broaden their horizon. (Xinhua/Huang Xiaobang)