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But here's the irony. "Mary is more likely to convince John than professor Mazur in front of the class," Mazur says. "She's only recently learned it and still has some feeling for the conceptual difficulties that she has whereas professor Mazur learned [the idea] such a long time ago that he can no longer understand why somebody has difficulty grasping it." That's the irony of becoming an expert in your field, Mazur says. "It becomes not easier to teach, it becomes harder to teach because you're unaware of the conceptual difficulties of a beginning learner."

To make sure his students are prepared, Mazur has set up a web-based monitoring system where everyone has to submit answers to questions about the reading prior to coming to class. The last question asks students to tell Mazur what confused them. He uses their answers to prepare a set of multiple-choice questions he uses during class.

Mazur begins class by giving a brief explanation of a concept he wants students to understand. Then he asks one of the multiple-choice questions. Students get a minute to think about the question on their own and then answer it using a mobile device that sends their answers to Mazur's laptop. Next, he asks the students to turn to the person sitting next to them and talk about the question. The class typically erupts in a cacophony of voices, as it did that first time he told students to talk to each other because he couldn't figure out what else to do. Once the students have discussed the question for a few minutes, Mazur instructs them to answer the question again.

When not in sessions, conversations didn’t end.

Mazur believes the purpose of education is changing. It used to be about mastering a certain amount of knowledge. But knowledge is growing and changing at such a rapid rate that it's impossible to learn it all. The key now is to find and use information, not remember and repeat it. And Mazur says the goal of educators should be to help students develop the skills to understand all the new information that will be coming at them throughout their lives. In other words, the purpose of education now should be to learn how to learn.