Just a few years ago, virtual worlds were credited with the power to transform the universe. Used since the late 1990s in military and medical applications, virtual worlds first gained mainstream media attention when Linden Lab released Second Life in 2003. While other worlds, including open source environments, have launched since then (examples…

Education in the 21st century is diverse not only in content and discipline but also in format and delivery. Today's students have access to a broad range of information, knowledge, ideas, and opinions well beyond their classroom. Never before have learners been able to interact so closely with instructors, mentors, subject-matter experts, and…

Open online courses (OOC) with a massive number of students have represented an important development for online education in the past years. A course on artificial intelligence, CS221, at the University of Stanford was offered in the fall of 2011 free and online which attracted 160,000 registered students. It was one of three offered as an…