Google has overhauled the way it serves up results in response to search queries.
The update is designed to work out whether a person wants up-to-date results or historical data.
The US firm estimated the alterations to its core algorithm would make a difference to about 35% of searches.
The changes try to make results more relevant and beef up features which Google believes set it apart from rivals.
By contrast, Microsoft's Bing search engine emphasises social search.
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