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spec: `` He is a man who likes to give his entire attention to a problem , so sooner or later I knew he would come to the conclusion that you ca not be a part-time philanthropist , '' said Vartan Gregorian , president of the Carnegie Corporation of New York and an informal philanthropic adviser to Mr. Gates . If his or her ability to produce urine is declining , fluid intake needs to be limited . Increased fluid intake increases the urinary output , thereby lowering the concentration of the substances involved in stone formation . `` To shun an entire community because of its racial makeup , is just as wrong as to reject an applicant because they are African American , '' said Attorney General Janet Reno . Note : Detection times vary depending on analytical method used , drug metabolism , tolerance , patient 's condition , fluid intake and method and frequency of ingestion . Marc , 22 , decided to engage in a spot of building jumping during his free time . Fluid and sodium intake was standardized for all children , based on their weight , to eliminate the possibility that enuretic episodes were related either to excess sodium or fluid intake . Prevention is by maintaining an adequate fluid intake to ensure the continued passage of clear and copious urine , especially during physical exertion .