The next big invention that will change the way we live should be things like ways of generating energy like electricity.

I'm truly saddened to learn of Steve Jobs' death. The world rarely sees someone who has had the profound impact Steve has had, the effects of which will be felt for many generations to come. For those of us lucky enough to get to work with him, it's been an insanely great honor. I will miss Steve immensely.

Your most unhappy customers are your greatest source of learning.

The Green Revolution focused on the big three - maize, rice and wheat - and the Green Revolution did not adapt the big three to African conditions, other than South Africa, as much as they should have.

Skype actually does get a fair bit of revenue.

Some very poor countries run great vaccination systems, and some richer ones run terrible programs.

We all need people who will give us feedback. That's how we improve.