Google's Knowledge Graph is pretty good at telling you who was the 37th president of the US, or what the square root of 342345 is. Ask it more complex questions, like "why does the sun set at night?" and it'll still send you off to find the answer yourself. Next week in New York, Google researchers will present a paper on its "Knowledge Vault," which Kevin Murphy of Google Research, describes as "the largest repository of automatically extracted structured knowledge on the planet." Knowledge Vault applies machine learning (unlike Knowledge Graph which is an extension of community supported tools) to automatically trawl webpages, assimilating their facts, information and connections therein. Not only does this mean it's faster, it can continually grow and update itself. The net result will be a huge database of knowledge, the likes of which would have been unimaginable just years ago.