Amit Singhal, senior vice president of search at Google, speaks at the garage where the company was founded on Google's 15th anniversary in Menlo Park, California September 26, 2013. Google Inc has overhauled its search algorithm, the foundation of the Internet's dominant search engine, to better cope with the longer, more complex queries it has been getting from Web users. Singhal told reporters on Thursday that the company launched its latest "Hummingbird" algorithm about a month ago and that it currently affects 90 percent of worldwide searches via Google.REUTERS/Stephen Lam (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS ANNIVERSARY)