There's no Plan B for what to do if the entire Net goes down. We should totally get on that. In a recent TED talk Danny Hillis, who just so happens to be the third person ever to register a domain name on the Internet and was around during its formative early days, pointed out something that may surprise you: If the Internet was taken out by a virus, an accident or a deliberate, concentrated attack, we have no "plan B." And because so many surprising services and systems rely on the Net today, much of what makes our society work could simply cease functioning.