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After more than a decade of level cigarette usage rates , twelfth graders showed an increase which began in 1992 , with 30-day prevalence rising from 27.8 % in 1992 to 31.2 % in 1994 . The resulting calculations suggested an investment of $ 2.76 million per dairy or $ 1,840 per cow for 1,500 cows . Biologists launched an ' open-source ' initiative last week which aims to make research tools , information and patented technologies more readily available to scientists , in particular in developing countries . The children undertook an environmental survey of the local area , designing a questionnaire to find out how people felt about the local area and what they would like maintained or improved .