The work of science exposition calls for people who make a career of it, Victor McElheny writes. They must have a course of development to follow, as a serial entrepreneur like George Scangos, the CEO of Biogen Idec (to choose an example from the particularly strident atmosphere of biotechnology), could tell us. Careers, accumulations of experience, imply structures with standards. And science journalists have to be more like intellectuals than most journalists. They have to stay at it longer to get good.