Bertie Carvel

I think. as a child, there's something frightening about certain adults, particularly when you're in their clutches or power. That must be the reason why Roald Dahl creates such brilliant characters: He taps into something in the collective memory of people.

Working with the children on 'Matilda' has been a joy. They don't do this professionally - their sense of discovery is instinctive, and the challenge for us adults is to keep that going in ourselves when we're doing it for the fiftieth or the hundredth time. To my delight and amazement, it hasn't gone stale - we discover it freshly every time.

What do cells do when they see a broken piece of DNA? Cells don't like such breaks. They'll do pretty much anything they can to fix things up. If a chromosome is broken, the cells will repair the break using an intact chromosome.