The Good blog has a video posted (below) of Peter Norvig talking about online learning at this year's Google I/O conference. Norvig is well known for his online course in computer science that attracted 160,000 students. He is also an AI expert who heads Google's search quality unit and a professor at Stanford.
About 13 minutes into the video, Norvig makes the comment that "the answer is easy" (...search on Google), "the interesting part is what was the question". My own variation on this is "the answer is easy, understanding the problem is the hard part". Many people define science as the determination of what we do not know. The pursuit of science is to answer the unanswered questions.
With the continuing increase in information and access to it, answers become less important. As I try to teach my students, what is interesting is what is currently outside the scope of human knowledge. Unfortunately most of us have been trained to focus on what is already known.
Norvig also has interesting comments on how to make online courses more effective and how to improve learning in general (minute 18). Norvig also comments on Nobel Prize winner Herb Simon and his thoughts on learning.