The moral systems of religion, I think, are super important.

Looking at these issues as a businessman, I believe that investing in the world's poorest people is the smartest way that our government spends money.

I watched the piles of feces go up the conveyor belt... They made their way through the machine... A few minutes later I took a long taste of the end result: a glass of delicious drinking water.

To succeed, you also have to know how to make choices and how to think more broadly.

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.

I've always been interested in science - one of my favourite books is James Watson's 'Molecular Biology of the Gene.'

If you go back to 1800, everybody was poor. I mean everybody. The Industrial Revolution kicked in, and a lot of countries benefited, but by no means everyone.