TED-Ed is both a site for finding educational videos and in the same time an effective tool for flipping them. The notion of flipping is inspired by Flipped Classroom Model. Teachers can easily browse through the videos using themed categories such as the Arts,health etc.`
TED’s videos are displayed on lesson pages that include multiple-choice quizzes, open-ended questions, and links to more information about the material. Professors who don’t want to rely on the premade content can press a button to flip the videos and customize some of the questions. With each flipped video, professors receive a unique Web link that they can use to distribute the lesson to students and track their answers. ( source : The Chronicle )
Read these two great articles one by Wired and the second by Chronicle to learn more about TED-Ed.
You can also watch this video entitled Lessons Worth Sharing