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.

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.

Ambient awareness is the experience of knowing what's going on in the lives of other people - what they're thinking about, what they're doing, what they're looking at - by paying attention to the small stray status messages that people are putting online. We're now able to stitch together these fantastic details and mental maps of what is going on in other people's lives.

That's the old ecological tale that explains humans' inability to fully appreciate global warming. To wit: if you drop a frog in a pan of hot water, it jumps out. If you drop it in a pan of cold water, then turn the heat up slowly, you can roast it to death.

A huge amount of our everyday thinking - powerful, creative, and resonant stuff - is done socially: talking to other people, arguing with them, relying on them to recall information for us.

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.

Memory has always been social. Now we're using search engines and computers to augment our memories, too.