By going from the bottom-up again, we see where successes work, and you can also see where the status quo can be the biggest obstacle or roadblock to success. The kind of entrepreneurs in whom we need to invest are the kind who are willing to fight that status quo, bureaucracy, complacency, and corruption.

May each of you live lives of immersion. They won't necessarily be easy lives. But in the end, it is all that will sustain us.

You should focus on being more interested than interesting.

There are cases where government-to-government aid actually has worked. Look at the eradication of smallpox and the near eradication of polio. But these are really top down solutions that require government-to-government support and aid.

The time for us to begin innovating and looking for new solutions is now.

1.5 billion people lack proper access to electricity. Many buy kerosene, which can cost 30 percent of their income. It sends millions of metric tons of carbon dioxide into the atmosphere every year. And often the lamp will fall over and catch the house on fire. So mothers hate it, but it's their only option.

I was going to save the world, and I thought I would start with the African continent.