US official says Iraqi scientists helping on arms By Carol Giacomo WASHINGTON, April 30 (Reuters) - Captured Iraqi scientists have started cooperating with the United States, giving U.S. officials renewed confidence that there are unconventional weapons in Iraq and they will be found, Deputy Secretary of State Richard Armitage said on Wednesday. "The people we have found are already leading us to other people as well as to computer files and to documents," he told the National Defense University, an elite school for America's military officers. "With these sources of information, we can say with a high degree of confidence...