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 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.

A young woman in her teens has about 300,000 eggs in her ovaries. By the time she is menopausal, none are left.

About 3 million IVF babies have been born since Louise Brown's birth in 1978. Bizarrely, when this life-giving treatment was first considered, it was massively controversial. A storm of vitriolic protest came from many religious leaders, journalists, politicians, regrettably even other scientists and doctors.

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Animal rights activists talk about cruelty and torture, some backing their assertions by publishing out-of-date photographs of 'experiments' banned long ago.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.

By discovering how our minds work, we can improve our learning power and unlock our true potential.

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?

Ethics is not routinely taught to science students except in medicine, and I think it should be.

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.

Having a child is arguably the most important thing you do in life.

However pragmatic you are, it is very demanding being a new parent.

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 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 know whether it is important to study science at a young age, though current thinking emphasises the need.

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 like travelling on my own. It means I'm completely free to think about what's around me.

I love the French detective series 'Spiral.' It's quite brutal to watch, but I'm already hooked.

I remember eating in school in the years after the Second World War. Most of my friends had miserable portions of Spam with an inedible, glutinous pudding served in containers we called 'coffins.' As a vegetarian, I had a lump of loathsome cheese and some bread.

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.

I think scientific arrogance really does give a great degree of distrust. I think people begin to think that scientists like to believe that they can run the universe.

I think that good parenting should allow children to be children. That naivety and slightly open way of looking at the world is very valuable.

I used to work for the World Health Organisation in poor countries all over the world - Bangladesh, Korea, the Philippines and India. You learn a whole range of things about how other people are living and try to connect with them to gain an understanding of where they're coming from.

I was born with my moustache and, no, I've never been tempted to shave it off. I don't spend a lot of time worrying about my face and, like Gilbert and Sullivan's Katisha, my best feature is my left shoulder-blade.

I went to school with butterflies of fear every day for years - from primary school onwards - not just worried about being bullied by classmates, but by teachers.

I've been all over the world on my own because, as a scientist, you travel a great deal if your work is reasonably successful or published. I get invitations to go to all sorts of strange countries where I would mostly be by myself and just meet other people there, instead of having travelling companions.

IVF is very commercial. The people doing it are among the best-paid in medicine: they charge a lot per treatment and it's not in their interest to make it more effective. Having people fail means that they come back again.

In prehistoric times, Homo sapiens was deeply endangered. Early humans were less fleet of foot, with fewer natural weapons and less well-honed senses than all the predators that threatened them. Moreover, they were hampered in their movements by the need to protect their uniquely immature young - juicy meals for any hungry beast.

In reality, both religion and science are expressions of man's uncertainty. Perhaps the paradox is that certainty, whether it be in science or religion, is dangerous.

It is important that legislation keeps pace with scientific progress.

It is possible that strong levels of belief in God, gods, spirits or the supernatural might have given our ancestors considerable comforts and advantages.

It is time my colleagues got real. All British universities doing worthwhile research use animals, and, instead of hiding, they should be boasting of their achievements.

It's extraordinary to think that if you walked into a room and said you had never heard of Hamlet, you would be regarded as a Philistine. But you could walk into the same room and say, 'I don't know what a proton is,' and people would just laugh and say, 'Why should you know?'

Man is a competitive creature, and the seeds of conflict are built deep into our genes. We fought each other on the savannah and only survived against great odds by organising ourselves into groups which would have had a common purpose, giving morale and fortitude.

Medicine, which I wouldn't be without, has also been a force for... less good. For example, if you look at our mishandling of the immune system, using antibiotics in children and avoiding infection, we've certainly increased the risk of asthma.

Much as I like and admire Richard Dawkins, I do think that to call a book 'The God Delusion' is very worrying because the title implies that if you don't believe in what I believe then you are 'deluded.' That, I think, is a dangerous concept and one that is unlikely to win hearts and minds.

My father died when I was nine, but I came from a stable family environment, which I think does contribute to being well-behaved.

My own field, the prevention of genetic disorders in babies, has been possible only because of humane work on animals.

Nearly all inventions are not recognised for their positive side either when they're made. So, for example, scientists didn't go out to design a CD machine: they designed a laser. But we got all sorts of things from a laser which we never remotely imagined, and we're still finding things for a laser to do.