Sal Khan's Quest to Make 'Mastery Learning' Mainstream EdSurge Podcast

Khan Academy has grown from a grassroots phenomenon on YouTube to a non-profit with a mission to change education. Its big idea is to promote a notion of mastery learning, where students don't move on until they understand each step through a curriculum. We asked Sal Khan how that broader goal of making mastery learning mainstream is going, and what's next for Khan Academy.