This programme to stop nuclear by 2020 is just crazy. If there were a nuclear war, and humanity were wiped out, the Earth would breathe a sigh of relief.

If it hadn't been for the Cold War, neither Russia nor America would have been sending people into space.

Humans are too stupid to prevent climate change from radically impacting on our lives over the coming decades.

I suspect any worries about genetic engineering may be unnecessary. Genetic mutations have always happened naturally, anyway.

I'm not religious, but I put it that way because I feel so strongly. It's the one thing you do not ever do. You've got to have standards.

Science always uses metaphor.

You mustn't take what I say as gospel because no one can second-guess the future.