I had explained in a book this way once. You measure things by shooting some form of photon at it and then looking at what happened (xrays, visible light, etc). Normally, that doesnt affect the object you are measuring since a photon is so small. But, trying to measure a photon sized object with a photon changes affects the result purely by measuring it. So therefore if we shoot a photon at another electron, we know exactly where it was, but now know nothing about where it is going, or we can use tests to figure out where its going, but we dont know where it currently is. But we can find a nice middle ground were we reasonably know about where it is and where its going, which is the electron cloud.
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