failure and mastery

In this video from TED, Slaman Khan talks about how and why he created the remarkable Khan Academy, a carefully structured series of educational videos offering complete curricula in math and, now, other subjects. He shows the power of interactive exercises, and calls for teachers to consider flipping the traditional classroom script -- give students video lectures to watch at home, and do "homework" in the classroom with the teacher available to help.

And more importantly, how to structure learning that rewards experimentation, encourages risk, AND results in mastery. Pretty cool.