Abacus

Abacus[[image:d.jpg align="right" caption="Abacus"]]
Invented during the Song Dynasty, the abacus is the ancestor of today's calculators. It was used by merchants to help count their profits, and tax collectors found it helpful in keeping track of revenues. It was made of a long rectangular board that had many beads on it, which made counting a lot easier.

Created by Stacy Fairey 11.07.08 Edited by Charlie Baker 11-10-08
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