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I came close to understanding Heisenberg's uncertainty principle by accepting that there are no 100% probability concerning anything in quantum physics. We are accustomed to know for certain if a thing's there or not, but all you get is a probability that the thing is there when you try to measure it... translating these concepts to plain English is not easy - we totally lack precision in our language to describe it in terms other than mathematics.
Our experience is that physical things are solid and independent from us, but this is not true on the quantum level of physics. Schrodinger's cat is a good example of something that follows the laws of quantum physics. We don't know if the cat is in the box before we look into it, and by opening it we are affecting the outcome by deciding the probability of the cat being alive or dead.
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