If you have picked up an abacus from a thrift store and watched your toddler play with the beads, like I have, and wondered if that's all there is to it, read on. Using an abacus ("soroban"), that ...

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 ...

When I first heard my daughter was going to take abacus lessons after school, I didn’t really know what to make of it. I never touched one myself and just considered it one of those obsolete tools of ...