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We should professionally challenge these ideas with solid examples from previous battles and wars , highlight current capabilities and work to get visibility on the Army Transformation story . Poorly written software might prematurely expire or validate a certificate based on comparisons of the date with the current date , although no current software is known to do this . The overall iVillage philosophy is to offer content to the population of potential users who have no current compelling reason for getting online . The study of heat transfer and fluid flow in a vertical Bridgman device is motivated by current industrial difficulties in growing crystals with as few defects as possible . Because the demographic model omits historical data on exploitation levels , its utility for assessing current stock status [ * * 21 ] is limited . Includes current affairs , area studies , ethnic studies , folklore , historiography and methodology , oral history , prehistory , government and political science , popular culture , urban affairs , and interdisciplinary studies . " It was driven not only by current financial realities , " Verba states , " but also - and perhaps more importantly - by the need to reassert control over our collections and to encourage new models for research publication at Harvard . Extensive research on voucher programs has been conducted , and it has yielded no solid evidence that private school vouchers improve student achievement.4 Since they lack scientific , research-based evidence of effectiveness , funding vouchers is counter to the rigor demanded by current measures of student achievement . Handbooks : Records document the requirements , policies , and offerings of specific instructional units for use by current or potential students .