From its simple origins to its emergence as a global nervous system, the Internet has changed the way the world works. In this fascinating overview, ARPANET pioneers and Usenet trailblazers describe how the Internet and e-mail came to be. Next, law enforcement officers and hackers from the L0pht address censorship, worms and viruses, and the challenge of Internet security. And finally, Web experts discuss the use of hyperlinks, graphical interfaces, search engines, and streaming technology to make the Internet more transparent, while the CEOs of DoubleClick and now-defunct DigiCash talk about the impact of e-commerce. A BBC Production. (50 minutes)