Sal Khan: Let’s teach for mastery -- not test scores

Would you choose to build a house on top of an unfinished foundation? Of course not. Why, then, do we rush students through education when they haven’t always grasped the basics? The founder of online Khan Academy, Sal Khan shares his plan to turn struggling students into scholars by helping them master concepts at their own pace. (This talk is from the upcoming special TED Talks: Education Revolution, which premieres Tuesday, September 13 on PBS stations.)