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5. The intensity of their language If you do not like the image currently showing, right-click on the desktop again and choose "Next desktop background" to see another one. The images will cycle automatically after an interval giving you something stunning to look at. The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions. Though the concept of animal testing might seem trivial, tests are less simple as smearing cold cream or lip gloss for the face of the rabbit. Animals found in laboratory testing, often proceed through extremely painful experiments and millions die every year. Those that survive the experiments don't get set free, instead they may be euthanized. In cosmetic animal testing; rabbits, guinea pigs, mice and rats can be used. Tests are done on finished products and individual ingredients to look for the products amount of toxicity and power to cause eye or skin irritations, allergies along with other harmful effects.