Imagine two flat screen televisions tuned to the same channel and sitting side-by-side. From a distance, their pictures are virtually the same, however up close, you can see subtle variations in the pixels - one blurred here, another dropped out there. Suppose some of these 'bad pixels' are known to produce periodic black-out spells on the screen. Would a sharper image revealing all of the defects help identify which of the screens works perfectly, and which one needs repair? Seven years ago, Dr... 
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