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Although most of the public attention on hydrogen has been focused on its potential as an alternative energy source to petroleum and other fossil fuels , a hydrogen economy will encompass much more than a substitution of one energy source by another . Persistent cookies are stored on your pc 's hard drive and do not disappear until they expire or you manually delete them . The immigration service grants “ duration of status ” to F-1 students by entering the notation “ D / S ” in the upper right corner of the Form I-20 and on the Form I-94 ( white card that is stapled into your passport ) . The stratum to which they are allocated is determined by their volume of total assets . Instructions for taking a soil sample , and containers for sending a sample can be obtained through your county extension office .