Professor Mazur discovered that his students can "learn" something conceptually and re-iterate it and pass exams but still fail to understand the subject or acquire the ability to apply that learning in real world situations. No amount of "lecturing", how ever good, solves this problem.
You will find more talks from Erik Mazur in this YouTube playlist.
In the first video, you get to learn his solution "to teach by questioning rather than telling". Note how he says to the students "So turn to your neighbour and see if you can convince one another of the correct choice" and then observe the conversation and engagement with the topic and how the students effectively teach each other.
This is the essence of my Knowledge Cafes and why I feel conversation is so important in business. Its the way we really get to engage with the world and to understand stuff. It's good to talk!