Bioterrorism is like earthquakes, you should think in order of magnitudes. If you can kill 10 people that's a one, 100 people that's a two... Bioterrorism is the thing that can give you not just sixes, but sevens, eights and nines.

I think Ebola is a great example of where the world really needs to come together. The three countries where this outbreak took place have had a lot of civil war, very weak health systems. And so, it did take a while for people to understand ....that eventually what we saw was a very unique Ebola epidemic. I think it is quite impressive what's being pulled together, and I think we will be able to get this under control.

My experience of malaria was just taking anti-malarials, which give you strange dreams, because I don't want to get malaria.

It's hard to improve public education - that's clear.

Government investment unlocks a huge amount of private sector activity, but the basic research that we put into IT work that led to the Internet and lots of great companies and jobs, the basic work we put into the health care sector, where it's over $30 billion a year in R&D that led the biotech and pharma jobs. And it creates jobs and it creates new technologies that will be productized. But the government has to prime the pump here. The basic ideas, as in those other industries, start with government investment.

I think any statement about stock prices is always suspect unless it's made by Warren Buffett.

A top-quartile teacher will increase the performance of their class - based on test scores - by over 10 percent in a single year. ... That means that if the entire U.S., for two years, had top-quartile teachers, the entire difference between us and Asia would go away.