If you count E-mail, I'm on the Internet all day, every day.

Drones overall will be more impactful than I think people recognize in positive ways to help society.

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.

We weren't trying to just go public and get rich. There was no near-term thing. It always was this many-decades thing where there were no shortcuts and we'd sort of put one foot in front of the other.

AIDS we're - most of these diseases - we are down from the peak. We're down about 40 per cent from the peak and if we got the right vaccines, which are at the early stage of discovering, then the numbers would come down very dramatically. So that's why we talk about it as an emergency.

So on the demand side [for energy], there have been a variety of policies that globally have been way over $50 billion a year of tax credits, raising the price of electricity through things like renewable portfolio standards, so the total amount of money that's gone into sending a price signal to push up demand versus what would happen without it has been gigantic.

Success is a miserable teacher. It tempts intelligent people to believe they cannot lose. And it is an unreliable guide to the future.