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Category:	Technology
Word Count:	4344
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	A Chronology of Computer History
	3000 BC: Dust abacus is invented, probably in Babylonia. 1800 BC: Babylonian mathematician develops algorithms to resolve numerical problems. 500 BC: Bead and wire abacus originates in Egypt. 200 AD: Saun-pan computing tray is used in China; soroban computing tray used in Japan. 1000: Gerbert of Aurillac or Pope Sylvester II devises a more efficient abacus. 1617: Scottish inventor John Napier uses bones to demonstrate division by subtraction and multiplication by addition.

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A Chronology of Computer History