Google launched its contextual and intelligent search service, Knowledge Graph, only a few months ago.

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Knowledge Graph will show search results in a new way, integrated with maps and other data.

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Those four technical challenges are: the knowledge graph, speech recognition, natural language understanding and (understanding) conversation, he said.

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Kurzweil says he plans to lean heavily on the Knowledge Graph to help improve natural language understanding as well.

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Earlier this week Google introduced us to its Knowledge Graph, a 500 million plus fact-filled database that it has developed from its own research and its acquisition of MetaWeb Technologies.

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The Android 4.1 update also aims to take advantage of some of the company's recent search innovations including its Knowledge Graph - an effort to offer useful information rather than links in response to queries.

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