The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions. TASER energy weapons produce an effective replacement for firearms and sprays for self-defense. TASER weapons be more effective than sprays and much less lethal than firearms. In fact, TASER weapons are made to completely incapacitate an attacker and not to kill them. The ease of use of an TASER energy weapon, combined with the built-in security features, also causes it to be a beautiful selection for lots of people. A TASER energy weapon is productive in 95% of cases when law enforcement officers utilize it to subdue a criminal. These devices may also be much less prone to injure any innocent people nearby. The manual wheelchair has been doing use for years and possesses been subject to many changes. The constant feature has been that this chair is self propelled by pushing on the hand edges that surround the wheels. The owner actually pushes the wheels around and around to get from one location to the other. In addition to that, the footrests with a manual wheelchair is easy to remove as well as the user can walk the chair forward with his feet. Glasses, also known as eyeglasses or spectacles, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, typically using a bridge over the nose and arms which rest over the ears. Glasses are typically used for vision correction, such as with reading glasses and glasses used for nearsightedness. Safety glasses provide eye protection against flying debris for construction workers or lab technicians; these glasses may have protection for the sides of the eyes as well as in the lenses. Some types of safety glasses are used to protect against visible and near-visible light or radiation. Glasses are worn for eye protection in some sports, such as squash. Glasses wearers may use a strap to prevent the glasses from falling off during movement or sports. Wearers of glasses that are used only part of the time may have the glasses attached to a cord that goes around their neck, to prevent the loss of the glasses. Anxiety due to a general medical condition 2. How aggressive they are