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Apple has a knack for spotting problems we didn't know we had. It can leave us wondering how we survived without vast libraries of music and TV shows in our pockets or the comfort of knowing "there's an app for that." Now, speculation is growing that in two weeks Apple will unveil a tablet-style touch-screen computer that is bigger than an iPhone but smaller than a standard laptop. If indeed that is Apple's next move -- the company won't comment -- it would have to show us why we ought to pay for yet another Internet-connected screen, on top of the TVs, computers and smart phones we already have.