One of the saddest things I've ever done is download 'I'm A Teenage Dirtbag' by Wheatus and play along with it with my headphones on. Oh, God. If you were to walk in and see me do that, you would really worry for me.

I enjoyed learning French, and I enjoyed speaking French.

As a committed Whovian, I cannot believe my luck in joining the Twelfth Doctor for one of his inaugural adventures. My only worry is that they'll make me leave the set when I'm not filming.

Death In Paradise' is my dream job - a fascinating character, great scripts, superb cast, and shooting in the Caribbean with French catering.

There's always been a quality to being a science-fiction reader. Usually, you're the only one in your class, or there are only one or two in your whole town. You're always the guy who reads that strange stuff.

There's no doubt that scientific training helps many authors to write better science fiction. And yet, several of the very best were English majors who could not parse a differential equation to save their lives.

As you continue to work on a show, if I still feel inspired, and I feel they are making exciting choices, then our enthusiasm remains. This is not a perfect science. It's an evolutionary process.

The weird thing about the arrow of time is that it's not to be found in the underlying laws of physics. It's not there. So it's a feature of the universe we see, but not a feature of the laws of the individual particles. So the arrow of time is built on top of whatever local laws of physics apply.