Google said the field trial of the new feature is now only accessible on its search website google.com in English. Singhal also announced that an enhancement to its search service, called Knowledge Graph, will now be extended to users in every English-speaking country after its launch in the US in May 2012. With the Knowledge Graph, users will see a panel on the right-hand side of the Google search results page, which provides a summary of key facts about users' search with the most useful and interesting information related to the particular topic. According to Google, the Knowledge Graph feature is based on its database which now includes more than 500 million real-world people, places and things with 3.5 billion facts about and connections among them. In another update to its search engine, Google Wednesday said that it will soon offer voice search in its search applications for users of Apple's iPhone and iPad following the availability of the function on devices running Google's Android operating system.