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Web 2.0 has given us great amounts of intelligent audio and video. It’s all free. It’s all enriching. But it’s also scattered across the web, and not easy to find. Our whole mission is to centralize this content, curate it, and give you access to this high quality content whenever and wherever you want it.

Thrun, a German-born and largely self-taught expert in robotics, is famous for leading the team that built Google’s self-driving car. He is offering his “Introduction to Artificial Intelligence” course online and free of charge. His remote students will get the same lectures as students paying $50,000 a year, the same assignments, the same exams and, if they pass, a “statement of accomplishment” (though not Stanford credit). When The Times wrote about this last month, 58,000 students had signed up for the course. After the article, enrollment leapt to 130,000, from across the globe.

Thrun’s ultimate mission is a virtual university in which the best professors broadcast their lectures to tens of thousands of students. Testing, peer interaction and grading would happen online; a cadre of teaching assistants would provide some human supervision; and the price would be within reach of almost anyone. “Literally, we can probably get the same quality of education I teach in class for about 1 to 2 percent of the cost,” Thrun told me.

Thrun believes there are technological answers to all of these questions, some of them being worked out already by other online frontiersmen.

While used textbooks are obviously less costly, they often carry another benefit new textbooks don't: highlights, underscores and other annotations by their previous owners. Even though the author of, and rationale for, the annotations may be unknown, the fact that somebody found particular sections of the book important enough to emphasize tends to make the eye linger. Ideally, annotations can make learning and knowledge discovery feel less like a solitary pursuit and more like a collaborative effort.

At first glance, it would seem that the trustworthiness of an unknown individual who has interpreted or appended an author's work would be questionable, but several reasonable assumptions can be made that contribute to the perceived authority of an unknown annotator. At the very least, they read the work and took the time to make the annotations, which may question or clarify certain statements in the text, and create links to other works, authors or ideas. The subsequent reader of an annotated work then has one or more additional perspectives from which to evaluate the usefulness of the text and annotations, and more implied permission to add his or her own interpretations than in an unannotated text. Published scholarly works are objects for discussion in an ongoing conversation among a community of knowledge seekers, and whether via formal citation in later publications or annotations in existing ones, all are designed to advance the generation and exchange of ideas.

Most critically, knowledge discovery and transfer is no longer restricted to a model of one expert creator to many consumers. In Web 2.0, consumers are creators, who can add their voices to both expert and non-expert claims. Users get the benefit of multiple perspectives and can evaluate claims in the best tradition of participative, critical inquiry.