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One of the most common fears is necrophobia, driving a car of death. This devastating fear affects countless people and will develop regardless of a person's health, age, or personal beliefs. It is a fear that may have far ranging consequences while on an individual's life. Often, folks are scared of anything that might be associated with death, like funerals, or less obviously, hospitals and horror films. In extreme cases, worries leaves sufferers crippled with fear. Although this fear is considered the most serious, through education and therapy, people can effectively rise above this anxiety disorder. Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System.