Although religion might be useful in developing a solid moral framework - and enforcing it - we can quite easily develop moral intuitions without relying on religion.

Animal rights activists talk about cruelty and torture, some backing their assertions by publishing out-of-date photographs of 'experiments' banned long ago. This is a misrepresentation. The work we do is performed with compassion, care, humanity and humility. I have never seen an animal suffer pain.

As parents, can we counter the effect of television violence? One worrying feature in Britain is that so many TV sets are in a child's bedroom; this means that the mediating effect of watching with a parent, the ability to discuss and interpret what has been seen, is lost.

Both in Britain and America, huge publicity has been given to stem cells, particularly embryonic stem cells, and the potential they offer. Of course, the study of stem cells is one of the most exciting areas in biology, but I think it is unlikely that embryonic stem cells are likely to be useful in healthcare for a long time.

Carbon dioxide is unusual because it doesn't go through the usual three phases of matter, from solid to liquid to gas, but it goes straight from solid to gas. The volume of the gas is much greater than the volume of the solid. When a solid turns into a gas, we say it sublimes. The process is sublimation.

Childhood depression tends to be more common in inner cities, being most frequently related to serious social deprivation, bullying, domestic violence, wartime experience and famine. It is, for example, a serious problem among children who are traumatised refugees.

Childhood is not dead. Children were worse off when we were hunter-gatherers; they were threatened in medieval times and exploited during the Industrial Revolution. Was it any better in the time of Charles Kingsley or Charles Dickens?

Far too many scientists, including my good friend Richard Dawkins, present science as the truth and present it as factually correct. And actually, of course, that clearly isn't true.

Following 25 children for the TV series 'Child of Our Time' has been extraordinary. The BBC's original plan was to commemorate the new millennium. What better way than to film a number of expectant mums from across the U.K.? Coming from widely different backgrounds, all were due to give birth on January 1, 2000.

However you define God, and whether you believe in God or not, the world we live in has been shaped by the universal human conviction that there is more to life than life itself; that there is a 'god' shaped hole at the centre of our universe.

I actually don't mind whether people can choose the sex of the baby - in fact humans have been trying to do it for 3,000 years. But there is a real issue about the safety of the technique.

I did not study science at school until I was 13, when I was totally turned on by a seemingly dreary old teacher who suddenly, unannounced, manufactured a huge explosion in the middle of a totally boring monologue. From then on, all of his class wanted to make explosions.

I do not know of any credible evidence that suggests Dr. Zavos can clone a human being. This seems to be yet another one of his claims to get publicity.

I don't believe in regretting - one should try to move on. My mum was good at that. She was deeply in love with my father, and he died when I was nine. She remarried, and her second husband died, too. I saw the grieving process she went through. My mother had this way of moving on. It was a fine trait.

I don't like being a celebrity, really... Some people get greater praise than they deserve because they have had exposure in the media. I don't think I agree with that at all.

I don't like seeing myself on television and I don't enjoy filming. What I actually enjoy is thinking about how I am going to express something or how we are going to make the visual metaphor.

I don't much like being a public figure, because so often how people appear is not how they really are, and I think one of the issues about our society is that we make judgments about people on the basis of very flimsy evidence.

I don't think you can impose limits on science because the very nature of homo sapiens is that he - she - is an inquisitive species. You can't control science. You have to control the effects of science.

I think humans have always wrestled with the Divine Idea - an idea that unites and separates, creates and destroys, consoles and terrifies. Throughout human history, it is an idea that seems sometimes to have caused whole populations to rise up and slaughter one another.

I think it's important for scientists to be a bit less arrogant, a bit more humble, recognising we are capable of making mistakes and being fallacious - which is increasingly serious in a society where our work may have unpredictable consequences.