When you're an expert in a subject, you can retain new factoids on your favorite topic easily. This only works for the subjects you're truly passionate about, though. Baseball fans can reel off stats for their favorite players, then space out on their own birthday.

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.

We use paper documents to store knowledge so we can consult and reconsult it, giving us a type of recall impossible with our unaided minds; we use pencils to scratch down material so we can manipulate it in a fashion impossible in our unaided minds.

Truly huge artistic collaboration on the Internet seems to work only if the gang has a well-defined objective.