U.s. and the e.p.a., they say six million to 10 million homes across the country have those lead pipes. we'll continue to watch how congress acts. all right, tonight, we're learning about a medical milestone. new surgery that uses genetically modified animal organs to save the lives of humans. this type of advance is sorely needed because about 12 americans die each day waiting for a kidney transplant. cbs news chief medical correspondent dr. jon lapook has an exclusive interview with the lead scientist. >> reporter: this experimental surgery is setting the stage for a revolution in organ tran...