expect any kind of radiation of any significance to come here to the united states or the west coast, is that your understanding, as well is this. >> that's my understanding. the dilution factor is just so high that the likelihood of there being any significant impact to individuals in the u.s. is remote. >> professor, thank you very much. appreciate it. the world prepares for military action against libya's dictator. he reacts calling for a cease-fire. but witnesses say that he is still attacking his own people. former assistant secretary of state jamie rubin joins me to give us a bit of perspective. [ male announcer ] opportunity