The tool that's most associated with the recent progress against malaria is the long-lasting bed net. Bed nets are a fantastic innovation. But we can do even better. We can invent new ways to control the mosquitoes that carry the malaria parasite.

The microprocessor is a miracle.

One thing people underestimate is how markets don't allow anyone to do anything except make better and better products. There's not much leeway. The world is a lot more competitive than most people think, particularly in a high-technology area. If a company takes its eye off improving its products, if it tries to do anything that would be viewed as an exercise of power, it'll be displaced very rapidly.

I'm a great believer that any tool that enhances communication has profound effects in terms of how people can learn from each other, and how they can achieve the kind of freedoms that they're interested in.

Our flame is taking the normal depleted uranium - the 99.3 percent that's cheap as heck, and there's a pile of it sitting in Paducah, Kentucky that's enough to power the United States for hundreds and hundreds of years. You're taking that and you are converting it to plutonium - and then you're burning that.

Natural epidemics can be extremely large. Intentionally caused epidemics, bioterrorism, would be the largest of all.

Whether it's Google or Apple or free software, we've got some fantastic competitors and it keeps us on our toes.