Knol is a project planne by Google for user-generated articles on topics ranging from "scientific concepts, to medical information, from geographical and historical, to entertainment, from product information, to how-to-fix-it instructions." It was announced on December 13, 2007. Knol pages are "meant to be the first thing someone who searches for this topic for the first time will want to read", according to Udi Manber, a Vice President of Engineering at Google. The term knol, named after a "unit of knowledge", refers to both the project and an article in the project. Several experts see Knol as Google's attempt to compete with Wikipedia.