In the past decade or so, a worrisome movement has cropped up that seems hell-bent on using bad science to try to protect their children: People who refuse to have their children vaccinated for various childhood diseases out of fear that their children will wind up brain damaged, or worse. It seems that they've triumphed: seven US states have reported an outbreak of measles to the Centers for Disease Control. Figures released by the CDC state that 64 cases of full-blown measles have been reported to doctors, with more expected to appear as the year continues. Slightly over one fifth …