San Francisco's about to become the nation's first city to require that retailers post the level of radiation emitted by cell phones. Consumers will also be pointed toward educational materials on the subject. The cell phone industry says that could be misleading. San Francisco Mayor Gavin Newsom, Democratic nominee for Lieutenant Governor of California, has promised to sign the measure passed 10-1 by the City's Board of Supervisors. Rachel Gordon reports for the San Francisco Chronicle.