Of the many TED-Talks, this is my favourite. It is funny, smart and - as far as I can tell - very true.
Sir Ken Robinson talks about how schools kill creativity in our society. In the talk, he point out, how children are not afraid to be wrong. "If you are not prepared to be wrong, you will never come up with something original."
Four years later, he returned to the TED-conference to continue his talk. This one is no less funny and just as inspiring.