Okay this is probably a numby question but I just thought of a question about the Uncertainty Principle:

In order to measure the velocity don't you already have to know the location?

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The first principle is that you must not fool yourself - and you are the easiest person to fool.
~~~ Richard Feynman ~~~
It is imperative in science to doubt.
~~~ Richard Feynman ~~~
Common sense is not so common
~~~ Voltaire ~~~