The kids are a big part of my schedule.

Haiti should remind us all that there is an immediate need to invest in and promote long-term development projects that are sustainable, scalable, and proven to work.

The main thing that's missing in energy is an incentive to create things that are zero-CO2-emitting and that have the right scale and reliability characteristics.

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.

Don't let complexity stop you. Be activists. Take on the big inequities. It will be one of the great experiences of your lives.

K to 12 is partly about babysitting the kids so the parents can do other things.

You have to be willing to see that sometimes the governments of these poor countries don't come through. You have to think about that as a constraint. How do you help them be better? How do you come up with things that actually work, even in those tough situations.