Is there Truth... maybe...
Would we ever be able to discern if we came across "truth" or not? probably not.
What we know as truth boils down to "intersubjectivity." What is accepted as true by the majority of people is accepted as true. Just look at astronomy or the sciences. It was once believed that the world was flat. This was "true." Then it was discovered that the earth is round and at the center of the universe... so on and so on.
If you want to read a great book on truth and science check out this book by Kuhn, http://search.barnesandnoble.com/Struct ... 083/?itm=4
As he finds, the fundamentals science is based on are no different than, say, religion... and, like I said, truth is basically whatever is generally accepted at the time (intersubjectivity).
The thing is, whether we can discover real Truth or not doesn't matter. What does matter is that we need the appearance of being able to do so.
If you do not have Truth, even if it is just intersubjectivity disguised as Truth, then anything is possible or allowable. There are no guidelines or rules to govern society.
Science, though its basic fundamentals may be no different than religion, has gained the reputation of being Truth, largely due to the quantitative aspect and being able to "prove" something, regardless of whether or not you are really proving anything and whether or not what you proved may be found to be false later on.
Also related to intersubjectivity are differences in personal interpretations of our world.
For those talking about colors, and Red always being Red... that is not necessarily the case.
There is never a one-to-one relationship between the world and how we perceive it. There is always a filter inbetween. Our own personal interpretation/perception of what we experience.
None of our senses are identical. Even the language we speak and our comprehension of it and the meanings of different words, phrases, or sentences differ within a single language. Bring in cross-language differences and you introduce even more problems. Ever heard a foreigner say that they are going to "go get on
their car"? It is not because they don't know how to speak english well enough, it is because the relationships between objects differs across cultures.
Back to colors, here in the U.S., we have something like 27 different unique color terms that we can identify. Some cultures have as few as 2 (with the same ocular traits that we have). For them, there may be only light and dark, or white and black. I think one culture, if I remember correctly, has Red and Black. For these cultures, all the other colors terms that we know simply do not exist, they are just shades of their two colors. Then there are all the other cultures somewhere between the min and max.
Then, the best representation of a color also differs between people of the same culture. The "best" representation of Red for one person may very well look like Purple to you. So how do you figure out what the "best" Red is? An average of sorts, Intersubjectivity. What is Red anyways, aside from a human creation to describe something we experience. If cones never developed in the eye would Red still exist? Might there be some evolutionary trait that may change color or light perceptions all-together? Would it be "progress?" Would it be "better?"
Anyways, sorry for the drawn out, wordy response.
Look up that book by Kuhn for more info. That, and Terms of Inquiry by Davis. Maybe read some Popper, Lakatos, or Feyerabend too.
Back to my point, there may very well be Truth, but we have to settle for popular opinion.