4 of 16: Apple CEO Tim Cook enters the stage during the Apple Developers Conference in San Francisco, Monday, June 11, 2012. Apple says it's introducing a laptop with a super-high resolution "Retina" display, setting a new standard for screen sharpness. The new MacBook Pro will have a 15-inch screen and four times the resolution of previous models, Apple CEO Tim Cook told developers at a conference in San Francisco. (AP Photo/Marcio Jose Sanchez) (AP Photo/ Marcio Jose Sanchez)

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