Today, we're very dependent on cheap energy. We just take it for granted - all the things you have in the house, the way industry works.

It’s been proven that of all the interventions to reduce poverty, improving agricultural productivity is the best.

It was really phenomenal [Warren Buffett donation]. It grew out of the friendship that we had and the fact that his plan to have his wife run the foundation and give things away changed when she tragically died.

Ninety percent of the cases of polio are in security-vulnerable areas.

Windows 8 is key to the future, the Surface computer.

I have always loved the competitive forces in this business. You know I certainly have meetings where I spur people on by saying, "Hey, we can do better than this. How come we are not out ahead on that?" Thats what keeps my job one of the most interesting in the world.

I see little commercial potential for the Internet for at least ten years.