Google has been constantly evolving the algorithm its search engine uses to make the search speedier and more accurate. The company has revealed a secret project codenamed Caffeine that a large team has been working on for last many months. The project involves the next generation infrastructure that will operate under the hood of search engine.
The interface will not change in anyway so a regular user may not spot any difference. But the search engine giant claims that it will improve many aspects of web search including speed and accuracy. Google engineers have actually rewritten some of the search engine's infrastructure (exactly what, the company has not revealed).
The beta search engine can be accessed here.