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I think the Commission , I guess , has defined it , but you know , feasibility is one of those words where the meaning changes depending on what you're talking about , including , I think , the backdrop of what the alternatives are , and I think the mine workers - - again , it 's a question of confidence - - are concerned that if there is this reliance on airstream helmets and the ability of operators to use airstream helmets , that that will , over time , redefine the word feasibility . But you should know the cultural and historical background of your art , even if you are an amateur , and once you have been shown a step , it helps to have an additional description to which you can refer at home . With these laws on the books , it could be said for the first time that no substance can legally be introduced into the U.S. food supply unless there has been a prior determination that it is safe . When I became AAS Secretary-Treasurer in 1976 , it had begun to move , but I then worried that the mounting expense of attending the annual meeting , especially hotel bills , would make it increasingly hard for people in our far from highly paid profession , and that we would see a flattening out or even a decline of membership . I do n't know - - I know a bunch of coal miners , I reckon because I am one , but our lives ai n't worth a lump of coal , guys , it 's worth a heck of a lot more to us . Hopefully , it will be included in DHI reports and databases in the future .