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

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.

Animal rights activists talk about cruelty and torture, some backing their assertions by publishing out-of-date photographs of "experiments" banned long ago.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

Parents should talk to their children, even when they are babies and can't talk back.

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.

To build and strengthen new connections, the brain needs the challenge of fresh and unusual stimuli. .... There's a lot of evidence to suggest that repetition is bad for brain health, and novelty is good.

When I grew up, we didn't have a TV, and I think more families today have ambitions of getting out of their environment, such as sending their children to university.