Especially working in infectious disease, it's very interesting because these infectious diseases, these agents, they evolve over time. So it's very much an arms race and understanding how each changes to protect itself and to continue. And so it's very much this puzzle-solving but with this great urgency and importance in what you find.

At 9, I think I had really gotten into tennis. I liked writing short stories; I loved solving math problems. I was learning a little piano, and I was collecting Garbage Pail Kids cards.

The process of discovery in my field is very incremental. But there are moments when you realize you know something about the world nobody else knows. That's extraordinarily exhilarating.

You get these moments of thrill. There you are, at 3:00 in the morning, and you know something about how we evolved that nobody else in the world knows. It's a thrill of discovery. You make this breakthrough, and you find something. It's this wonderful, wonderful scavenger hunt when you got to the end. It's just so great to be a scientist.

Without free speech no search for truth is possible... no discovery of truth is useful.

I started to see acting as a real science. That really helped me grow as an actor.

I teach 18- to 21-year-olds - the 'Harry Potter' generation. They grew up as voracious readers, reading books in this exploding genre. But at some point, I would love for them to give Umberto Eco or A.S. Byatt a try. I hope 'A Discovery of Witches' will serve as a kind of stepping-stone.

Genetic modification has many different areas, for example in medicine, and Britain is at the leading edge of this new technology. I don't know, but people tell me, it could indeed by the leading science of the 21st century. All I say to people is: 'Just keep an open mind and let us proceed according to genuine scientific evidence.'