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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. The hard starting problems of diesel engines in below zero / freezing temperatures are generated by two factors. One is the initial cold air being drawn in to the turbocharger and compressed in the engine?s cylinder head. The second is the fuel itself, is also cold and also this sub zero / freezing temperature fuel is sprayed to the cold engine?s combustion chamber, where it mixes while using cold air drawn thru turbocharger. However the humans living for the spaceship were different to the humans who're living on the planet now. They were so fat that they are struggling to walk. they travelled around in motorised chairs with a monitor and cup & straw attached, chatting on phones and when they happened to fall out they just laid there until a robot came along and picked them up. The adults were fat, the children were fat! They just laid around all day consuming doing no exercise what so ever and to quote the captain, "Computer, define dancing".