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The great TV classic ER helps teach armchair physicians to become amateur diagnosticians. He's in shock! She's got kidney stones! Rule-out pheochromocytoma! But sometimes a little knowledge can be a dangerous thing. You've learned somewhere - on the network news, in the Science section of The New

As with much in life that we take for granted, we are not usually concerned with the mechanisms of how our bodies work and how they do what they do. Such knowledge is not required for use of these magnificent machines that have been freely given to us. But just as a wise consumer will care for her or