The first communications satellite,called Telstar,was launched from Cape Canaveral on July 10,1962.This markad the start of rapid transmission of TV signals over wide areas.What we take for granted today-satellite television, cellular telephones,wireless and high-speed Internet connections,and so forth-were part of science fiction only 40 yeays ago. Teenagers today are the first real citizens of the digital world.Unlike their parents,they have grown up in a world in which electronic delivery of information and entertainment is natural and more accepted than conventional forms like the newspaper,tape,or film.