> How do you deal with the fact that we don't know why anything at all exists? Why, for instance, do atoms, subatomic particles, etc, exist AT ALL? Why not NOTHING?

The "why something instead of nothing" question is one of those universal philosophical questions, but it's interesting to consider the fact that we have no concept or example of the alternative (true nothingness). If you think about it this question is kind of odd in that it carries a hidden assumption that nothingness is the normal state of things and existence (of anything, not just biological life) is somehow abnormal. Why should we have reason to believe that?