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You Get What You Measure.
You may think that the title means if you measure accurately
you will get an accurate measurement, and if not then not; it
refers to a much more subtle thing - the way you choose to
measure things controls to a large extent what happens. I
repeat the story Eddington told about the fisherman who went
fishing with a net. They examined the size of the fish they
caught and concluded there was a minimum size to the fish in
the sea. The instrument you use clearly affects what you see.
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