Word: ultraviolet
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...resistant strains of the bugs. Experts now say the best way to combat the nearly 10 million cases a year is hand combing. The LiceMeister comb enables parents to remove head lice and nits manually, and a new shampoo just invented at Yale promises to make nits glow under ultraviolet light, making them easier to spot...
...secret behind Moore's law is that chipmakers double every 18 months or so the number of transistors that can be crammed onto a silicon wafer the size of a fingernail. They do this by etching microscopic grooves onto crystalline silicon with beams of ultraviolet radiation. A typical wire in a Pentium chip is now 1/500 the width of a human hair; the insulating layer is only 25 atoms thick...
...carcinogens. Of these, 14 are new additions and six are upgrades. Tobacco products were new entries, never listed before because in the past the government considered only individual chemicals that make up a product (the benzopyrene in cigarette smoke, for example) rather than the product itself. Environmental carcinogens like ultraviolet radiation are also included for the first time. (For highlights of the report, see captions...
Unfortunately, protection against uvb doesn't guarantee protection against longer-wavelength ultraviolet-A, a second form of UV radiation that penetrates deeper into the skin. The academy and the fda are still trying to figure out how to test and rate the effectiveness of sunscreens against this part of the UV spectrum. Until they succeed, look for products designated as "broad-spectrum" sunscreens, offering some protection against both forms...
Easy-to-apply sunscreens are an ideal way to protect yourself and your children. But pay attention to the sun protection factor, or spf, rating on the label. It tells you how effective a product is in blocking out ultraviolet-B, the most damaging part of the sun's burning rays. The academy strongly recommends sunscreens with an spf rating of at least 15; some kinds are available with ratings as high...