Under UV light, tar from the Gulf of Mexico oil spill lights up orange-yellow on the beaches of Gulf Islands National Seashore (picture) while clean sand glows purple in a long-exposure picture.

长曝光拍摄的图片中，大片的油污在紫外线下发出橙黄色的光，干净的沙子为紫色。这是海湾岛国家海滨沙滩上的情景。

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Graduate student Kirby hopes that ultraviolet light can be used on beaches to guide oil-spill cleanup operations.

研究生Kirby希望紫外灯能用于指导沙滩上的油污清理工作。

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Boots worn by University of South Florida graduate student Katie Brusché are stained with yellow-brown tar from the Gulf oil spill, as seen under ultraviolet light in a long-exposure photograph.

南佛罗里达大学研究生 Katie Brusché 穿着的一双靴子。

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"As a result of LEDs it is now possible to place light exactly where it is needed and to greatly reduce spill light and energy wastage, " he said.

BBC: LED streetlamp aims to improve public's view of stars

Maybe you think that it is better to have a tanker spill light sweet crude from Saudi Arabia (with all of its human rights abuses, especially against women) all along your west coast, than to maybe spill some bitumen on land which would be a thousand times less intrusive on the environment.

FORBES: A Roundup Of Reactions To The Keystone Pipeline Decision

When it comes to the Obamas planning their summer, is there any discussion now in light of the oil spill to them perhaps vacationing on a Gulf beach?

WHITEHOUSE: Press Briefing