About the two types of knowledge (and a proposition for the third, and fourth)

I was reading Ryan Sholin’s piece Why we link: A brief rundown of the reasons your news organization needs to tie the Web together and the part where he wrote “Because we absolutely do not know everything, but we know where to find out most of what we don’t know” reminded me of the saying etched in a wall that I read in the Multnomah County Library of Portland Oregon back when I was in high school and thought that run-on sentences were bad.

That saying was about the two types of knowledge:

There is knowledge that you know, and there is knowledge that you know where to look to find.

Thinking about that now I can imagine a third:

What you think you know, but don’t.

And a fourth:

What you think you know where to find on the web, but which has since disappeared from that location and is no longer in google’s cache.

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