Google's search engine is powerful, but not all-knowing. The search engine that processes more than 100 billion queries and returns results with microsecond speed, is far from perfect. On a daily basis, 15 percent of queries submitted have never been seen before by Google's search engine. This has made the search engine think a bit harder to render a result.
In the process of trying to know more and reduce the 15 percent of these "unheard" queries, Google crawls 20 billion websites per day in search of new data that it can turn into results.
A key part of Google's quest to reduce the percentage of unseen queries, and provide answers rather than lists of links, is the Knowledge Graph. Its database, according to Google, understands more than 570 million entities and 18 billion facts about connections between them.
However, Google admits that the Knowledge Graph's actual knowledge that is an integral part of Google Search, is tiny compared with the human brain.
"Knowledge Graph has good coverage of people, places, things, and events, but there is plenty it doesn't know about. We are at 1 percent," said John Giannandrea, Director of Engineering for Knowledge Graph.
