As you get to the end of the project you want to run all the tests cases against one version and make sure that you know that that version passed everything. And so as you get late in the project you get a little more conservative about making radical changes to the software.

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

Looking at these issues as a businessman, I believe that investing in the world's poorest people is the smartest way that our government spends money.

Philanthropy should be taking much bigger risks that business. If these are easy problems, business and government can come in and solve them.

I didn't even complete my University Education

Going out in the field, it's always enlightening to see what's working and what's not and to sit down and talk - I was with young girls in south Africa - understanding why our tools for prevention aren't being adopted, and what way may need to invent to help protect them.

My broad sense of this is that authors like Smil really paint the clear picture, and once you see that, it's kind of Oh, of course. That's such a primal thing to all these physical services that we take for granted.