At its headquarters in Mountain View, Calif. Tuesday, Marissa Mayer, VP of search products and user experience, said that Google has deployed new computing infrastructure to distribute queries across Google's different search indices and to return the aggregated relevant search results on the Web search results page.
"Google is integrating its siloed search engines to offer Google universal search," said Mayer.
Google's Web search now returns relevant videos, images, news, maps, and books, alongside Web site links.
The engineering effort took over two years and more than 100 engineers. The reason is that running a query across multiple search indices multiplies the computing resources required and Google's engineers had to figure out how to avoid multiplying its computational load.