Assisting to the Coursera course is giving me a good feedback about what can be done in the education area.
The on-line education based on videos can be very productive.
Today I watched a video, he was doing a practice, explaining how to identify markers for arguments, you can see him talking and at the same time pay attention to the board. He was explaining the practice and enabling some silences to provoke you have time to think and look for the answer, then he continue talking.
There were a time were I was paying more attention to the way he was doing the practice and the tricks used to transmit the knowledge than to the content of the practice.
Pedagogy is the science of the education, the technology used by the professor is already there, the amazing thing is how well he is using it for pedagogic purposes.