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We have even talked to astronauts on the moon.

We now have vacuum tubes, transistors, integrated circuits, satellite communication and microwave cable. It was about a hundred years ago that the telephone and phonograph were invented, and these were followed by radio, motion pictures and television. Shannon reflected on the subject of information technology: "The growth of both communication and computing devices has been explosive in the last century. His pioneering work revolutionized the field of communication and information technology, and his lively personality and active imagination endeared him to his friends, family and fellow communication theorists. Claude Elwood Shannon used mathematics to unify communication theory.