Chances are you know a young person aged 11–31. You may be a parent, aunt, teacher, or manager. You've seen these young people multitasking five activities at once. You see the way they interact with the various media—say, watching movies on two-inch screens. They use their mobile phones differently. You talk on the phone and check your e-mail; to them, e-mail is old-school. They use the phone to text incessantly, surf the Web, find directions, take pictures and make videos, and collaborate. They seem to be on Facebook every chance they get, including at work. Instant messaging or Skype is always running in the background. And what's with those video games? How can someone play World of Warcraft for five hours ...

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