If you don’t know what TED Talks are go immediately over to http://www.ted.com/
and take a look at one of the 1400 videos. Seeing is believing.
In short, TED Talks are relatively short videos (around 18 minutes) from some of the most engaging speakers around the world. Some famous TED speakers include Bono, J. J. Abrams, Bill Gates, Jane Goodall, and Stephen Hawking. These videos cover an endless range of topics, initially about Technology, Entertainment, and Design (TED), but now incorporating any number of subjects. Plus, they are free to distribute and share non-commercially under a Creative Commons license.
Note that this is a TEDx talk. TEDx was created in the spirit of TED's mission, "ideas worth spreading." It supports independent organizers who want to create a TED-like event in their own community.