Photo taken on May. 17, 2012 shows a giant rosewood abacus at an abacus museum in Nantong, east China's Jiangsu Province. The traditional use of the abacus for calculating in China was newly added to the list of the World's Intangible Cultural Heritage, announced the United Nations Educational, Scientific and Cultural Organization (UNESCO) on Dec. 4. (Xinhua/Xu Congjun)