Here is an article on what makes Ted Talks so great.
3. How can anybody learn to tell stories that are as enthralling as a TED Talk?
The first thing to know is that there's no one formula or way to give a TED Talk. They're as unique as the speakers themselves. The real key is authenticity. TED Talks work when speakers share both their personality and their original ideas with the audience. You can't just lecture. You have to be passionate; you have to be willing to be vulnerable. This doesn't mean giving the audience jazz hands or shedding crocodile tears. It means sharing your curiosity and your excitement, your failures along with your successes. It’s also about telling stories that take the audience on a journey. And allowing your own contagious enthusiasm to inspire the audience in their own work. And helping the audience to see the world through your eyes. If you can get people to see the world differently, then that’s a talk that will be truly memorable.
All that said, a great TED Talk also takes PRACTICE. With very limited time (only 18 minutes or less), you have to know your material inside and out, so you can present in a way that feels polished but -- importantly -- not rehearsed. You have to practice with real audiences so you get the feel for the rhythm of a talk: When are they riveted? When do you lose them? It's only by test-driving a talk that you can learn what works and what doesn't.
In the end, TED Talks are about great, old-fashioned human storytelling.
Here are the top 20 most watch Ted Talks to date.