I find the Ted Talks riveting and exciting to use in class. It's easy to use subtitles in English and each one lends itself to making a few content questions so as to get your students to properly pay attention. To make it more attractive, you could try to find a subject matter they are currently working on for Physics or some other subject.
Also, it is good to discuss ethical issues, seeing as these keep popping up in their central
exams. Here's one example, albeit without the questions.