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Scott Huffman, Google's engineering director of search evaluation, poses in front of the Google 3D globe that illustrates the usage of Google search in the world at Google headquarters in Mountain View, California, on April 7, 2011. Software engineers reverently refine Google's search algorithm so consistently that it often ends a day a tad different from when it started. Scott Huffman's team tested "many more than" 6,000 changes to its search engine in 2010, with 500 of them passing the grade to become permanent. "We have changed engines on a flying plane so many times it has become second nature to us," Google fellow Amit Singhal said, referring to how Internet firms modify services while they are live online. AFP PHOTO/KIMIHIRO HOSHINO

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