(Xinhua2008-09-21)

Children learn kownledge by watching a scientfic experiment eqiment during an science popularization activity in Fuzhou, southeast China's Fujian Province, Sept. 20, 2008, the National Science Popularization Day of China.

Pupils take part in a scientific sports meeting in Wuhu, east China's Anhui Province, Sept. 20, 2008, the National Science Popularization Day of China.

A teacher of Ruiqing Chinese School teaches her student in Stockholm, capital of Sweden, on Sept. 20, 2008. Ruiqing Chinese School held its normal opening ceremony on Saturday.

Pupils take part in a robot football match at Xingfujie Primary School in Weifang, east China's Shandong Province, Sept. 20, 2008m the National Science Popularization Day of China.