Google Knowledge Graph

I order to be more precise search must embed semantic reasoning.   In Mashable, an interview about the challenge and the use of semantic knowledge networks.   Google Knowledge Graph Could Change Search Forever.  
" ... The future of Google Search, though, could be a very different story. In an extensive conversation, Singhal, who has been in the search field for 20 years, outlined a developing vision for search that takes it beyond mere words and into the world of entities, attributes and the relationship between those entities. In other words, Google’s future search engine will not only understand your lake question but know a lake is a body of water and tell you the depth, surface areas, temperatures and even salinities for each lake.... "