HackerLet's use video to reinvent education | Salman Khan
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Khan 展示了两种不同的反馈。学生能暂停和回放视频，教师则能从练习记录中发现谁卡住了，再安排同伴讲解。这两种安排改变的是下一步怎样学。
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they can pause, repeat at their own pace, at their own time.Or even better, "Let me get one of the green kids, who are already proficient in that concept, to be the first line of attack, and actually tutor their peer."