I'm not a skeptic to truth! There are many truths out there and I'm saying this.
Even if we don't know neither the biggest facts nor the smallest facts, we should affirm our existence and its whole journey up to today, 22.04.2010, and assert that we pretty much know all that's between these levels/frontiers in the boundary, being between these biggest and smallest facts. That is: our language is precise when it's applied within this boundary and consequently it expresses truth!
I think I'm very much aligned with both Tarski's theory of truth and the Logical Positivists' protocol sentences.
I have really told this story, being a kind of Cumulativist version, in a Philosophy in Science class in Spring 2008. The story is that astronomy represents the biggest facts and physics, biochemistry and medicine to mention some, represent the smallest facts. Everybody knows by now that knowledge in astronomy has grown enormously since ancient times and that the cattle on the fields are now consisting of molecules and DNA where they've been representing meat and milk before, perhaps in 2000 BCE.
You can hold your hands in a 45 deg. arc with one straight hand pointing downward and the other straight hand pointing upward to give a very fine, simple picture of this Cumulativist version above and it probably goes well with the young in being a story of Philosophy of Science you can tell them.
By Terje Lea, 20.03.2010, 21.03.2010 and 22.04.2010.