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I've been fascinated by the fact that many of our kids halfway around the world - - the finest , most dedicated , most highly motivated troops we've ever had - - are sending in absentee ballots . Compelled by the advances of the anti-imperialist movement across the globe , including southern Africa , in the face of the most determined resistance by the United States and its allies , Kissinger thought it was time that the United States itself should at least begin to give the impression that it welcomed this process of change . However , the use of combinatorial techniques in catalyst discovery is hampered by the complexity ( a large number of variables can influence catalytic activity ) and poorly developed methods and tools . In the brain , these uncertainties are overcome by using more than one processing stage to form a stream . With regard to development , the Doha Ministerial Declaration is permeated by references to special and differential treatment in favour of developing countries , and also contains a provision to consider the binding of special and differential measures . Efforts to increase awareness about HIV among the general population are hampered by low literacy levels and cultural influences .