Nigeria has moved into low-middle-income, but their north is very poor, and the health care systems there have broken down.

The scientific understanding of some of these [childhood] diseases is advancing quite rapidly. There's some things like premature birth or nutrition, first day deaths that we need a lot more insights so that we can build the tools to solve those problems.

So we can simulate Richter-10 earthquakes. We simulate 70-foot waves coming into these things. Very cool. We basically say no human should ever be required to do anything, because if you judge by Chernobyl and Fukushima, the human element is not on your side.

As we look ahead into the next century, leaders will be those who empower others.

Your most unhappy customers are your greatest source of learning.

We all have the chance to create a world where extreme poverty is the exception rather than the rule.

Other paths would include making nuclear fission cheap enough and safe enough that people broadly embrace it, so that could be scaled up.