Visitors try to lift the beads of the huge abacus, one of which weighs 6.3 kilograms, at China Abacuses Museum in Nantong, east China's Jiangsu Province, Dec. 20, 2008. The abacus, 781 centimeters in length and 1.81 centimeters in height, has been on display here since Saturday. (Xinhua/He Jianrong)

A huge abacus made of sandalwood is displayed at China Abacuses Museum in Nantong, east China's Jiangsu Province, Dec. 20, 2008. The abacus, 781 centimeters in length and 1.81 centimeters in height, has been on display here since Saturday. (Xinhua/He Jianrong)

Visitors try to lift the beads of the huge abacus, one of which weighs 6.3 kilograms, at China Abacuses Museum in Nantong, east China's Jiangsu Province, Dec. 20, 2008. The abacus, 781 centimeters in length and 1.81 centimeters in height, has been on display here since Saturday.