Hi all, My understanding of the Heisenberg uncertainty principle is this: 1) in order to measure something, we have to hit it with something smaller. 2) in order to know the exact position of something we have to know the exact position of the thing we hit it with. 3) therefore, we cannot know the exact position of anything, because we don't and can't know the exact position of any smaller particle/wave we could measure it with. My first question is: is this an okay explanation? My second question is more general, and is my biggest issue with QM (so far). Many people suggest the following leap in logic, but I can't follow it. They say, since the HUP states that we cannot know the exact position/velocity of a particle, that a particle doesn't have one exact position/velocity. This leap between position/velocity being "unknowable" by us and being actually "indeterminate" is lost on me. Just because you don't know how many fingers I'm holding up doesn't mean I'm not holding up a particular number of fingers. Sure, for your purposes, you might create a probability curve to represent the number, but, again, that doesn't mean I actually have a finger "cloud". Help me get on track here. Thanks.