Critic's Notebook: Opera plugs in to the high-tech

Visual spectacle gains new ground amid a high-def push onto movie theaters and mavericks like Tod Machover and Trimpin conjuring up bold new visions.When Opera America holds its annual conference in Boston next month, futurist and technology guru Nicholas Negroponte, the founder of MIT's Media Lab, will give the keynote address. In attendance will be America's administrators, iPads in their hands and 3-D goggles in t…

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