Getting back to the earlier issue of incorporating new evidence / facts:
Absolutely and Epicurean is always going to look for, observe, and incorporate new facts into his application of the philosophy and how to live.
BUT what is the number one fact that must be considered?
The first and most important fact is that you are a finite being, and you are never going to have access to all of the evidence / facts that you would like to have.
So if that is the case, what do you do?
You start off with a framework of analysis that acknowledges that you are finite, while the universe is infinite, and you perfect your "operating system" - your "philosophy" - that allows you to function confidently within the sphere of facts that are open to you.
That's what Epicurus did, nothing in the intervening centuries has been discovered to change that framework, and that's why his work is valuable today in its original form, rather than being "improved" by all sorts of changes which ultimately fade into significance in the face of the practical need to live and take action in an unlimited universe in which the evidence open to us is limited. Epicurus shows us how to defeat the numbing and paralysing and slavery-inducing effects of standard religious teaching and Academic philosophy.
And that's what I also think is so dangerous about accepting the implication that such and such a scientific theory has it all figured out, or that the "universe" is all expanding from a center, or that Yahweh is the one true god, or whatever. If you keep focus on the logical big picture that the universe is infinite in time and eternal in space, then it's easy to see that all these shortsighted theories are ultimately traps, and it's easy to dismiss them as impossible. That is a huge confidence-builder in the face of nihilism, and it's totally justified by the evidence that is available to us -- nothing in our experience (or in reliable human history) has ever come from, or gone, to nothing. All the rest is deduced from that factually-irrefutable starting point.
EDIT: I want to expand on this point in the future so I am setting up this thread in Physics: Proposition: It is not the "science" of Epicurus that should impress us, but rather the "perspective" on science, or, if you will, the "limit" on science.
