Update: On top of the news about a cluster of brain tumors in one Missouri town comes the shocking news about Senator Edward Kennedy. Without many specifics, of course, the very fact of a malignant tumor is devastating enough. The item about Cameron, Missouri, appeared in news reports much earlier this morning and caught the eye even without any process of associations to link it to Sen. Kennedy's condition. The town of Cameron, Missouri, population 6,500, has had more than a dozen brain tumor cases diagnosed within the last seven months, according to a local television station. Excerpts from news reports:   more »