What is a knowledge worker?

As an addendum to this post, I would claim that anyone becomes a knowledge worker when they have to think. And people only think when they are prompted by the unexpected. So a knowledge worker is someone who faces the unexpected.

The reason more & more of us can be tagged as knowledge workers is not that work is becoming more virtual (though it is). Nor is it that more of us are "symbolic interactionists" (though we may be). It is because the world is getting more complex. More interconnected. And the unexpected is getting more and more common.

How do we educate people to deal with the unexpected?