Land degradation, rising sea levels, famine, and conflict will continue to drive people from their homes and towards cities, with megacities like Mexico City and Lagos becoming increasingly common in some of the poorest parts of the world.

When it comes to providing aid, developing innovations, and making bold steps that change the course of history, the United States is usually on the front lines.

No country in the post-colonial era has thrived without first building its capacity to conduct scientific research.

I wish we could have state-of-the-art hospitals in every corner of the earth... but realistically, it's going to be a while before that can happen. But we can immunise every kid on earth, and we can prevent these diseases. It's only a matter of political will, a little bit of money and some systems to do it.