And now, by collaborating with Ted Ed, we have come up with a way which I hope you will find really useful if you're a school teacher and quite fun if you're a pupil or just somebody at home, because you don't have to be a teacher.

To use this, we've produced a whole periodic table of questions.

One set of questions about each element on the periodic table based on our video.

And what is nice about the Ted ID system is that once you're registered, if you don't like our questions, you can write your own and use them for your class or use them on your friends.

So it's a completely tunable system to your needs, and it will help, we hope.

Use our videos in whatever education contents you want.

You can even write the questions in completely different languages from English.

This has been a collaboration between Nottingham and the University of Gerona, who sent a student who helped us do the background research for doing these questions.

So thank you very much.

Pent on.