Toy companies like Anatex and Imaginarium --a division of Toys R Us Holdings--still sell abaci too, since they're often used to teach mathematics to kids.

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Corporate Connections: Abaci aren't as popular as they once were, but you can still buy one from companies like American Science and Surplus or Advance Engineering.

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Abaci are still widely used in the East, with slight variations in design--such as the number of beads and wires, and the presence of dividing beams--occurring between countries.

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Toy companies like Anatex and Imaginarium --a division of Toys R Us Holdings (nyse: TOY - news - people )--still sell abaci too, since they're often used to teach mathematics to kids.

FORBES: No. 2 The Abacus