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Abacus
This Site offers a wealth of information regarding the abacus including its history, several articles, how it is used and many illustrations. One of these articles is on how an abacus beat a calculator in doing several calculations in a very important duel between a Japanese Postal worker and an American accountant, Wow! The Site also offers links to different examples of abaci from different countries and cultures. I give this site an excellent rating because I offers a wealth of information and I found some of its articles interesting, particularly the one comparing the abacus to the calculator. Its very complete in the subject of the Abacus.
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