The International Atomic Energy Agency and its chief, Mohamed ElBaradei, have won the 2005 Nobel Peace Prize. The Committee said it chose Baradei and the IAEA “for their efforts to prevent nuclear energy from being used for military purposes and to ensure that nuclear energy for peaceful purposes is used in the safest possible way.’’ Washington has long been at odds with Baradei for his consistent challenge to US claims, particularly about alleged Iraqi weapons of mass destruction.