Training the workforce of tomorrow with today's high schools is like trying to teach kids about today's computers on a 50-year-old mainframe.

Don't wallow in failure. Instead, learn from it.

Cutting through complexity to find a solution runs through four predictable stages: determine a goal, find the highest-leverage approach, discover the ideal technology for that approach, and in the meantime, make the smartest application of the technology that you already have - whether it's something sophisticated, like a drug, or something simpler, like a bednet.

The US in some ways has been the best. Who figured out shale gas? Although that wasn't a good thing [for CO2 levels], it was very innovative. It's led to low-cost energy. Who figured out nuclear power? Largely the United States. Once you get past the steam engine, which is mostly British, then the US has been at the center of most of the energy things that have happened.

If I only had two dollars left I would spend one dollar on PR.

In the next 15 years, we can halve childhood deaths. That's doable.

Often you just have to rely on your intuition.