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Though it 's not a primary focus of his work , Michael Mayer , who trained in chemistry and biophysics , is also intrigued by a 20-nanometer motor called ATP synthase . " Amartya Sen is recognized as the foremost authority in the field of welfare economics in the past century , and has not only developed the most advanced theories in this field , but has also issued a global call for action regarding the alleviation of poverty and inequality . Ohio law requires that property owners keep their properties safe and free of hazards . " Songs of Innocence and Experience " received its world premiere in Stuttgart , Germany , in January 1984 . Formerly on faculty at the Judge Advocate General 's School , he was also senior adviser to the U.S. ambassador-at-large for war crimes issues , where he implemented policies relating to international criminal law and the law of armed conflict .