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Photo Credit: Danny O However the humans living around the spaceship were different to the humans who are living on earth now. They were so fat that they are can not walk. they travelled around in motorised chairs having a computer screen and cup & straw attached, chatting on phones and if they happened to drop out they simply laid there until a robot emerged and picked them up. The adults were fat, your children were fat! They just laid around all day long meals doing no exercise what so ever and to quote the captain, "Computer, define dancing". The EGR system routes a number of the exhaust gases (6 ? 10%) over the EGR valve, in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they cannot burn within the combustion chamber; also, the exhaust gases take up many of the space which will rather be taken from the intake air. This reduces the level of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions.