Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Project Halo, is a project funded by Paul Allen''s Vulcan Inc. The project was initially led by Oliver Roup and Noah Friedland but is currently led by Mark Greaves, a former DARPA Program Manager. Project Halo is an attempt to apply Artificial Intelligence techniques to the problem of producing a "digital Aristotle" that might serve as a mentor, providing comprehensive access to the world''s knowledge. The project was started in October 2002 with a pilot study in which three separate groups of researchers, from Cycorp, ontoprise, and a consortium comprising of the University of Texas at Austin, SRI International and Boeing Phantom Works, built systems capable of answering Advanced Placement Test level questions in sub-areas of chemistry.