These can be made to emit white light by coating the device with a phosphor compound that absorbs part of the blue light and re-emits it as yellow.

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The BBC team saw a lot of soldiers inside the compound and some old, light anti-aircraft guns attached to the back of trucks.

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The testimony shed no new light on activity being carried out at the compound or why Stevens was there the night of Sept. 11 when we know he feared for his safety.

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This is particularly relevant in light of an Aug. 16 cable, which clearly states that the compound could not be defended against a coordinated attack.

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Both diamond and a new compound called graphine are made of carbon and are reported to move energy as close to the speed of light as we may achieve.

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More than 10 years ago, researchers at Massachusetts General Hospital in Boston and other centers discovered the compound aminolevulinic acid, or ALA, is a photosensitizer, meaning it is activated by certain wavelengths of light.

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