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 ...

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 ...

Put down your coffee for a moment. Now, without thinking about it too much, use your hands to count to 10. How did you do it? Did you start with the left hand, or the right? Did you begin counting on ...