Article: Scientific advances show how UV-rays cause skin cancer.(Originated from Knight-Ridder Newspapers)

WASHINGTON _ Ah, summertime! Picnics ... baseball ... beaches ... the sun toasting your bare skin. Alas, those glorious sunbeams are potential killers.

For years, doctors have warned that ultraviolet rays cause more cancers than nicotine, pesticides, automotive fumes or any other carcinogen. About 850,000 new cases of skin cancer _ about 9,000 of them fatal _ are expected this year in the United States alone.

Recent advances in molecular science are revealing how those tiny, invisible waves of solar energy _ no more than 10-billionths of an inch from crest to crest _ create such havoc.

Physics, chemistry and biology are all involved. A product of the ...

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