We're all human. After 10, 15 years you get tired, you run out of steam and ideas, you have to give a chance to somebody else. And whether you yourself are inclined to stay on, all those around you are pushing you to stay on for what they will gain.

Sometimes I walk into a situation and I know somebody is going to provoke me - not maybe, I know he will provoke me - I know he will provoke me! And there are times when I simply refuse to be provoked. And the other times you have to use that superior knowledge to carry on at work without distraction, and don't allow yourself to be distracted. I laugh a lot inside and outside, and at myself sometimes.

I observe a lot. I see a lot around me.

The past year's natural disasters have highlighted the invaluable contributions of volunteers in our communities. They have volunteered their time, energy and skills to save lives and to rebuild communities. In this they joined countless people around the world who volunteer every day in response to 'silent crises'. These often unsung heroes understand all too well that poverty, disease and famine are just as deadly and destructive as earthquakes, hurricanes and tsunamis.

As we move forward, you cannot resolve the potential food crisis or shortages without science being part of the solution. Science has to be part of the solution but African governments - and these are decisions for governments, whether they embrace or do not embrace genetically modified food - and for the moment, most African companies do not accept genetically modified seeds.

When we talk about the UN, what are we really talking about? We are talking about my country, your country, other countries and their collective will to stand together and apply pressure or offer incentives to steer things in the right direction. When the nations of the world come together, with collective will, on an issue and they speak with a united voice, they have a much greater impact. When there is division, then the impact is much, much less.

To build a more healthy, peaceful and equitable world the classrooms of the world have to be full of girls as well as boys.