Word: shielding
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Reports about the ozone layer are as maddeningly variable as the protective shield itself. Estimates of the problem's severity fluctuate virtually with each new set of measurements from the atmosphere. Unfortunately, the estimates do seem to possess one common thread: they are getting worse. Last week's announcement from the Environmental Protection Agency that the shield may be | disappearing nearly twice as fast in northern latitudes as many scientists had predicted is the most alarming report to date. The study noted that the loss was occurring both farther south, over the most populous regions of the U.S., and later...
...gamma rays. For example, gamma-ray bursters have been measured releasing more energy in a matter of seconds than the sun does in thousands of years. Since they carry no electric charge, gamma rays can plow through space unchanged, giving scientists a clear record of cosmic events. The atmosphere shields the earth from most gamma radiation, but this shield has forced scientists studying the rays to rely on instruments lofted aboard huge balloons or rockets. Until now researchers have only peeked through the veil of the universe; last week's GRO launch gives them a powerful tool and years...
...FIRST TIME that Harvard's student press encountered Neil Rudenstine, he was slipping out a side entrance of Boston's Ritz Carlton Hotel. His head buried in his jacket to shield his face from the cameras, Rudenstine dove into a waiting limousine, reportedly slouching behind the tinted windows to avoid the gaze of a small band of reporters...
...planes have different strong points. Northrop's YF-23, with its sharp, surprising lines, may be stealthier. Its engines are slung under its wings, but their exhaust is sprayed into troughs on the wings' upper surfaces to shield from heat-seeking missiles, a technique borrowed from Northrop's B-2 Stealth bomber. The material surrounding the exhaust outlets in the YF-23 can withstand a temperature of 540 degrees C (1000 degrees F), while the undersurface only a few inches away never gets hotter than 140 degrees C (280 degrees F), making the plane hard to detect by enemy infrared...
While it took months for Desert Shield to be transformed into Desert Storm, U.S. policymakers were scrambling for cover within days of the invasion, trying to defend their actions from the harsh judgments of hindsight. The great "Who lost Kuwait?" debate was on. Revisionism was rampant. But what was clear was that the roots of a failed policy went back more than a decade. The American embrace of Saddam Hussein began on Nov. 4, 1979, when the Islamic revolutionaries who had overthrown the Shah of Iran seized the U.S. embassy in Tehran and took 66 Americans hostage. That cataclysmic event...