The abacus is considered the oldest calculating device used by humans but in the 1940s, a Korean man invented an abacus-like counting method using fingers called jisanbeop or chisanbop, a term that ...
*Refers to the latest 2 years of stltoday.com stories. Cancel anytime. First-grader Neha Gupta patiently explained to one adult how to count using a Chinese abacus set in a shoebox lid and made out of ...
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