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Hornbook. Paper was scarce and expensive during the Middle Ages and until the early 1800's. It had to be used sparingly. The hornbook was invented to protect the paper on which the first lessons of young children were printed. It was used as early as 1442. By the end of the 1500's, the hornbook was standard equipment in English schools. Use of the hornbook continued in England and America until about 1800, when books became cheaper. Today, hornbooks are rare collector's items. More »
Communications Satellite Corporation (COMSAT)
Communications Satellite Corporation (COMSAT), a private corporation, was a leading provider of... More >>
Cybernetics, sy buhr NEHT ihks, is the study of control and communication in machines and... More >>
Information retrieval is a branch of computer and information science that develops systems to... More >>
Information theory describes how messages are transmitted and received through such electronic... More >>
International Telecommunication Union (ITU)
International Telecommunication Union (ITU) establishes regulations on the international use of... More >>
McLuhan, muhk LOO ihn, Marshall (1911-1980), was a Canadian professor and writer whose theories... More >>
Propaganda is one-sided communication designed to influence people's thinking and actions. A... More >>
Public opinion refers to the opinions or views of people in a community or country on issues of... More >>
Public opinion poll is a survey that attempts to find out the attitudes, beliefs, or opinions of... More >>
Public relations, often called PR, is an activity that uses communication to increase... More >>
Telecommunications refers to communication across a distance by means of various types of... More >>
Wireless communication involves sending and receiving information through the air or through... More >>
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