Children watch a device demonstrating the principles of animation at Keqi Community in Hefei City, capital of east China's Anhui Province, Dec. 4, 2019. Keqi Community and Hefei Science and Technology Museum jointly held a themed activity on Wednesday to promote popular science among children in the community with lots of scientific experiments to inspire their interests. (Xinhua/Liu Junxi)

Children participate in a scientific experiment at Keqi Community in Hefei City, capital of east China's Anhui Province, Dec. 4, 2019. 

Children observe a scientific experiment at Keqi Community in Hefei City, capital of east China's Anhui Province, Dec. 4, 2019.