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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. Plasma cells moving relative to the other person induce electric currents in one another, generating filamentary currents and forming electrical circuits. Prodigious amounts of electrical power developed in one plasma cell could be carried over many billions of light years through these filamentary currents to burst suddenly (as a possible electrical discharge) from a small and localized region. Nobel laureate Hannes Alfvén had proposed that, "...X-ray and gamma-ray bursts [in space] could be due to exploding double layers." Furthermore, since double layer gets energy from the entire circuit, the explosion may be a lot more energetic than expected through the souped up that is locally present.