Word: ultraviolet
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Security for Arafat included snipers, dozens of uniformed and plainclothes officers and more than 75 police vehicles, including a helicopter. Tickets were checked with an ultraviolet scanner, and bags were left at the door...
...assessment bill that could be used (among other mischief) to end the phase-out of ozone-destroying chlorofluorocarbons. Dollar benefits of regulations must justify dollar costs. Fine. Sounds good. But how do you measure the dollar benefit of brighter first-graders and an ozone layer that blocks cancer-causing ultraviolet rays...
...species on Earth 225 million years ago, according to research published today in the Proceedings of the National Academy of Science. The study's authors theorize that an explosion as far as 185 trillion miles away could have eroded the earth's protective layer, exposing plant life to deadly ultraviolet radiation and thus disrupting the food chain. A supernova has long been a suspect in the planet's most severe episode of mass extinction, but today's evidence is the first to connect an exploding star with destruction of the ozone. TIME science writer Michael Lemonick explains, "This...
...There are essentially two issues [in determining ozone depletion]: the rapid change of aerosol loading, dictating the amount of surface area that is exposed, and the change in ultraviolet radiation," Anderson says. Regional and seasonal variations can lead to vast differences in ozone levels, he adds. "The polar regions are almost different planets...
...order to vote, voters are required to have their knuckles marked with an invisible ink, detectable only under ultraviolet light. Election officials check knuckles to ensure that no one votes more than once-a quick make-shift alternative to voter registration...