What is the true nature of existence? Parallel Universes, multiple dimensions, strings?
Superstrings may exist in 11 dimensions at once. Physicists I leave this one to you. I have tried on many occasions to wrap at least a few brain cells around string theory (may those neurons rest in peace). If science ever comes to grips with the nature of our physical reality and devises the Grand Unified Theory of everything, I sure hope the math can be translated into more conceptual terms. If it turns out that we live in only one (or four) of 13 dimensions or some other such craziness, we prove it, and I still cannot understand it, it will be a sad and anticlimactic day. Well, those are the best questions I have to offer. Again, please feel free to leave your own two cents. I am sure there are worlds of interesting and important scientific questions left to be answered.