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Do vaccines for children cause autism? That question has vexed parents since a 1998 study suggested there was a connection. But on Tuesday, Lancet, the medical journal that published the article, fully retracted the study, calling it "utterly false."Some are greeting the retraction with a sort of grim joy--for them, the victory comes much too late. Others, reflecting on the furious debate, lament the the politicization of science. Still more say the retraction is unlikely to change the minds of countless parents who cling to hope that autism--if caused by vaccines--may be reversable. Here's how the massive opinion swell is breaking down: