Imagine the following scene.  You take your car into a repair shop because it is not running well.  After a thorough check your mechanic tells you that your engine is damaged and will need a complete overhaul, which will be expensive and take a great deal of time.  You respond by suggesting that perhaps if you clean the windows, put more air in the tires and hang an air freshener on the rearview mirror, the problem will go away.  Your mechanic insists the problem is much deeper and more substantial, but you respond with confidence that if you just get the car washed and replace the wiper blades the car will run just fine….

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