I was wondering if modern physics considers quantum mechanics that follows from the hysenberg principle to be actually the way the universe functions, or simply that it is the extent of what we can possibly know with observation. I mean it seems to me that most of quantum mechanics is saying that there is a limit on what we can know through observation, and this is a science which can make predictions about what we can know. The actual rules which govern the universe are too small. Or is it considered that when we arent looking at a particle, for example, it phyisically is in multiple places at once. If it is making physical descriptions of the world, then how did it go from the idea that we can never really know everything about a system because our observations are limited, to this being an actual physical phenomenon and not just a limitation of ourselves?