[NJ_gent]

"This is just my opinion, but physical theories seem to explain what is know today, but fail eventually at the edges of knowledge. It could be that existence is infinitely deep, turtles all the way down."

That's precisely why theories are modified when new information that doesn't "fit" with current understandings is discovered. There are plenty of theories which have, thus far, held up to all available scrutiny. Einstein's Relativity is doing just fine, but that doesn't mean it's perfect. What it does represent is a far better understanding of the universe and its laws than what we had under Newton. We've made remarkable progress in our understanding of the universe in just a few hundred years, and our rate of discovery is vastly increasing. Since scientists aren't perfect, we have the Scientific Method and peer review to push us towards the truth instead of simply assuming we've found the truth.

[js1138]

That's precisely why theories are modified ...

Of course. I'm just suggesting that there will always be work to do.

I was discouraged from a science career by looney teachers who taught that almost everything was known, or about to be.

I rather welcome the current fight over ID. It makes it clear that there are still problems as deep as those that faced 19th century physics.