What is the secret ingredient the best TED Talks share?

To quote what is probably your English teachers’ favourite website (it certainly is mine…for class use, at least): “There’s no single formula for a great talk, but there is a secret ingredient that all the best ones have in common. TED Curator Chris Anderson shares this secret — along with four ways to make it work for you. Do you have what it takes to share an idea worth spreading?”  Now, we don’t expect you to give a TED talk during your English classes at CELSA, but the advice Chris Anderson gives in this short video is certainly worth bearing in mind if you don’t want your classmates and, later, professional audience, itching to look at their smartphones…