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Substantial improvements for narrow linewidth and low noise are often indispensible for sensitive applications in spectroscopy . I continue to find it hard to believe that some publishers believe that these techniques are effective , but they must work often enough for them to continue the practice . Block club captains are often responsible for distribution of issue flyers and meeting notices to all residents . These letters of recommendation are often crucial for admission to off-campus programs , RA and mentor positions , and graduate programs . All this , however , requires the kind of thinking , they say , that is often counter-intuitive for the way businesses operate , and runs counter to the notion frequently peddled by consultants that you can " harness " creativity and direct it to line up with intention . " This technique allows students to get by just often enough for them to keep trying it ; in reality it fails far too often , leads to weak understandings , and does not permit students to perform up to their capabilities .