TED, (Technology, Entertainment, Design) is a nonprofit organization that is dedicated to promoting ideas worthy of spreading, something they do very often in their conferences and lectures.
Some of the speakers of these lectures and conferences are well known and respected people like the ex President of the United States Bill Clinton, Nobel Prize winners James D. Watson and Murray Gell-Mann, the spokesman for climate change Al Gore, and also the co-founder of Microsoft Bill Gates.
This application comes with hundreds of hours of achieved audio and video in which you can listen to some of the best speeches from these speakers, in which they explain and develop their ideas so everyone else can obtain their point of view from various subjects.
TED is a very good application for anybody who is eager to learn more and wants to expand their knowledge and try to see many things from different points of view.