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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.
The Red Baron airplanes manufactured by Albatros evolved steadily throughout World War I. The first plane flown by Richthofen was an Albatross C.III, a two-seat general use biplane that has been eventually manufactured in larger numbers than any C series Albatros. It was employed for photo-reconnaissance, bomber escort, and light bombing, and is the plane that Richthofen trained as being a pilot in.
In the field of archaeology, most of the evidence are metal, such as musket bullet, cartridge, bullets, artillery and shells, shrapnel and/or of the sword, what are the specific evidence depends on the battle took period of history. Thus, the most important tool for field archaeologists is simple metal detectors
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