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It was such a radical design change that Apple had to abandon traditional welding methods in favor of a process called friction-stir welding, which combines friction-generated heat and pressure to force molecules from two separate aluminum surfaces to mingle with one another. What emerged was a sleek display measuring just 5mm at its edge with up to 40 percent less volume than the previous generation. It was roughly a year ago when Apple revamped its all-in-one line, tasking the company's engineers to flatten the design as much as possible without sacrificing performance. It's hard to believe there's a full fledged system packed inside Apple's slim and sexy iMac chassis.
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