• Glowing Oil: Gulf Spill Under Ultraviolet Light

    Ultraviolet light could help scientists and cleanup crews detect oil in the aftermath of the BP spill. That's what National Geographic photographer Chris Combs learned while in the Gulf of Mexico. UV light, which is used to find blood at crime scenes, could help scientists find oil too difficult to see with the human eye. In this photo from Gulf Islands National Seashore, tar appears orange-yellow, while clean sand glows purple in a long-exposure picture. The full photo essay is at <a href="http://news.nationalgeographic.com/news/2010/07/photogalleries/100708-environment-science-gulf-oil-spill-glowing-ultraviolet-pictures/#gulf-oil-spill-ultraviolet-light-glowing-ghost-crab_23066_600x450.jpg" target="external">NationalGeographic.com</a>.
  • Glowing Oil: Gulf Spill Under Ultraviolet Light

    In this photo, taken near Pensacola Beach, Florida, tar patties and tar balls in the center of the image glow orange-yellow under ultraviolet light.
  • Glowing Oil: Gulf Spill Under Ultraviolet Light

    A ghost crab eats oil from the Gulf oil spill in this picture taken at the Gulf Islands National Seashore. Under ultraviolet light, the oil glows yellow-orange.
  • Glowing Oil: Gulf Spill Under Ultraviolet Light

    Ultraviolet light shows a footprint surrounded with orange-yellow oil.
  • Glowing Oil: Gulf Spill Under Ultraviolet Light

    Boots worn by a University of South Florida graduate student are stained with tar from the oil spill when seen with a UV flashlight.
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PHOTO: In this stock image, a lumberjack is pictured.
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PHOTO: Left, an undated file photo provided by the Spokane County Sheriff shows Bombing Kevin William Harpham; right, in this undated photo provided by the Johnson County Sheriff, Frazier Glenn Cross, Jr., appears in a booking photo.
Spokane County Sheriff/AP Photo| Johnson County Sheriff via Getty Images
PHOTO: The tires of a Studebaker, missing since 1971, are visible in Brule Creek near Elk Point, S.D. in this undated file photo.
South Dakota Attorney General?s Office/AP Photo