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First computer built

Although Charles Babbage had designed computer-like machines, none of his machines was ever completed in his lifetime. Most scientists agree that the first computer was built in 1939 by American inventors John Vincent Atanasoff and Clifford Berry. They called it the… Continue Reading

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World War II

Twenty-one years after World War I (page 78), the world was plunged into another world war. Many historians believe that tensions started with the peace treaty that ended World War I. That treaty forced Germany to pay large amounts of… Continue Reading