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' Water: The body is approximately 60% water, give or take. There are many different opinions about how much water we should be drinking every single day. The health authorities commonly recommend eight 8-ounce glasses, which equals about 2 liters, or half a gallon. This is called the 8??8 rule and is quite simple to consider. However, there are additional health gurus who think we have been always about the brink of dehydration therefore we need to sip on water constantly the whole day. Many of the processes inside you rely heavily on water, so it is important that you get motor this essential nutrient in what you eat. 5. The concentration of their language Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light. Typical sunglasses are darkened for protection against bright light or glare; some specialized glasses are clear in dark or indoor conditions, but turn into sunglasses when in bright light. Most sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be ordered. Specialized glasses may be used for viewing specific visual information (such as stereoscopy) or 3D glasses for viewing three-dimensional movies. Sometimes glasses with no corrective power in the lenses are worn simply for aesthetic or fashion purposes. Even with glasses used for vision correction, a wide range of designs are available for fashion purposes, using plastic, wire, and other materials.