A girl stands on a special rolling box at the Heilongjiang Science and Technology Museum in Harbin in northeastern China's Heilongjiang Province on Saturday.

A girl beats on a drum without a drum skin at the Heilongjiang Science and Technology Museum in Harbin in northeastern China's Heilongjiang Province on Saturday.

Students play a steel ball with their parents at the Heilongjiang Science and Technology Museum in Harbin in northeastern China's Heilongjiang Province on Saturday.

(Xinhua News Agency February 18, 2008)