India just went 3 years with no cases [of polio]. Pakistan is our toughest location right now because some parts of the Taliban have not allowed vaccinators to come in and have even attacked vaccinators. We are hopeful this will get resolved since no one wants their kid to be paralyzed. I spend a lot of time making sure the polio campaign is doing the best it can. We have great computer models that help guide our activities.

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.

Making sure all our students get a great education, find a career that's fulfilling and rewarding, and have a chance to live out their dreams ... wouldn't just make us a more successful country - it would also make us a more fair and just one.

The Internet? We are not interested in it

Common Core is a big win for education.

There's 20 companies that I have investments in - some batteries, some solar-thermal, one big nuclear thing. We need hundreds and hundreds of companies like that, so that in a 20-year time frame we really are starting to change the energy infrastructure.

The fact that there was no catastrophic pandemic in recent history does not mean there won't be another one. And we are certainly not prepared for the next pandemic.