"Many people," Kornell noted, "have had the experience of listening to a computer instructor open a menu and go through a series of steps. Then you try to do it, and you don't even know which menu or what the first step is. If you are passively following along, you won't remember it as well as if you're forced to do it yourself. Active learning is much harder, but if you can do it successfully, you will remember it much better in the long run.

As it turned out, this was one of the best courses, online or onsite, I have ever taught. Not only did I witness enormous engagement among almost all of the students, but the level of learning was much higher than in previous years.

The feedback from the students on the course was very positive, better than I had received for the onsite course in previous years. One of my favorite written student comments was, "… I don't know how this course could be taught as effectively in the classroom."

The physics department has replaced the traditional large introductory lecture with smaller classes that emphasize hands-on, interactive, collaborative learning. Last fall, after years of experimentation and debate and resistance from students, who initially petitioned against it, the department made the change permanent. Already, attendance is up and the failure rate has dropped by more than 50 percent.

“Just as you can’t become a marathon runner by watching marathons on TV,” Professor Mazur said, “likewise for science, you have to go through the thought processes of doing science and not just watch your instructor do it.”