Well, in a way similar to René Descartes, who said: "I think, therefore I am". Off course, we cannot even be quite sure there is such a thing as the self, doing the thinking, but there is at least something experiencing itself to be me and thinking. This is what I mean with knowledge in its deepest, philosophical meaning.

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[U]President Josiah Bartlet:[/U] Sweden has a 100% literacy rate. 100%! How do they do that?
[U]Leo McGarry:[/U] Maybe they don't and they can't add.