Until the 1980s radiation oncologists could only crudely estimate where to aim based on the position of nearby bones in 2-D X rays.

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Games aside, the system can play 3-D Blu-rays and movie downloads.

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Exposure to the sun's rays normally generates Vitamin D in the skin, but applying sun block stops that process.

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This wouldn't matter in a lower latitude, because the body can synthesize vitamin D if exposed to ultraviolet sun rays.

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Many kids aren't getting enough from their diet or the sun, especially since sunscreen can block vitamin D formation as well as blocking harmful rays, so take 'em outside!

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In winter, experts say, people in the northern half of the U.S. don't receive enough UVB rays from the sun to make vitamin D, regardless of whether they use sunscreen.

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Grace also hired three academic lung experts to examine X rays of 471 plaintiffs who said they'd contracted lung cancer from asbestos.

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