The humanitarian developers behind World of Warcraft have also discovered a way to bribe gamers into turning off their computers and going outside. If you log off for a few days, your character will be more 'rested' when you resume playing, a mode that temporarily speeds up your leveling.
I don't think the Internet has replaced cities in any significant way, nor really could it. Cities are dynamic - and deeply seductive for the people who flock there - because they broker all sorts of fantastic and useful connections, cultural and economic and social.
The only reason we don't notice how absolutely interwoven our thinking processes have become with older technologies - pencils, paper, electric light, penicillin, fire - is that they're old, so we've ceased to notice their effects.
A textbook requires a consistent sense of style and a linear structure, hallmarks of a single authorial presence. An encyclopedia doesn't.
More than any other modern tool, computers are a total mystery to their users. Most people never open them up to fix them or to see how they work.
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