"One challenge was being able to regularly search through all of the additional content types to find relevant results. After all, you don't know if there might be a minor news story or an obscure book relevant to your query unless you go and check. But Google's massive compute cluster -- and much effort by our infrastructure experts -- gave us a leg up on that one, and we can now search these disparate types of information about as efficiently as we search our massive index of web pages. We may have melted down a data center or two along the way, but then bugs are part of life in this business!"
Google Official Blog, Behind the scenes with universal search
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