Top 6 Abacus nominated for World Intangible Cultural Heritage

In December, China's Zhusuan was nominated by the United Nations Educational, Scientific and Cultural Organization (UNESCO) as a World Intangible Cultural Heritage. Zhusuan, or the knowledge and practice of arithmetic calculation using an abacus, has a history of more than 1,800 years. For centuries, the abacus was a major calculating device. Abacus lessons were compulsory in primary schools until the 1990s and later became an optional subject.

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