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Diesel engines are becoming the predominant power behind modern tractors simply because they have the highest thermal efficiency of the internal or external combustion engine, due to their higher than normal compression ratio. Unlike gasoline engines, the diesel engines in tractors use highly compressed hot air to ignite the fuel as opposed to spark plugs. Children having Obsessive and Compulsive Disorder and therefore are having Behavioral Therapy are taught concerning how to deal and manage their obsessions and compulsions without performing some actions or rituals into it. Children may initially still find it hard to go away on their own recurring and persistent thoughts and actions but since the behavior therapy continues they eventually learn concerning how to manage their disorder. Behavior therapy also gives children the bravery and strength to address their symptoms.