Scientists tend to build a reputation on refuting the theories of those who have gone before. Yet, whatever we hypothesize, observe, measure or record about the natural world, it leaves more unanswered questions.

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

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.

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 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.