See the article here:

Announcing a new way to use video to create customized lessons: the “Flip This Lesson” feature from TED-Ed, now in beta at ed.ted.com. With this feature, educators can use, tweak, or completely redo any video lesson featured on TED-Ed, or create lessons from scratch based on a TEDTalk or any video from YouTube. How? Just Broadcasting platform : YouTube Source : TED Blog Discovery Date : 25/04/2012 11:27 Number of articles : 3

Flip it! A new way to teach with video from TED-Ed