As a species, we've always been discoverers and adventurers, and space and the deep ocean are some of the last frontiers.

In the first eight or so years at Microsoft, we were always chained to our terminals, and after I got sick the first time, I decided that I was going to be more adventurous and explore more of the world.

In global warming, I think everyone is scratching their heads - are there technological things that can be brought to bear that can make a difference?

As a species, we've always been discoverers and adventurers, and space and the deep ocean are some of the last frontiers.

I'm a very private person that prefers a low profile.

What should exist? To me, that's the most exciting question imaginable. What do we need that we don't have? How can we realize our potential?

That would be such a life-changing thing, for us all to know that there are other beings out there who we could potentially communicate with, or maybe we are listening to a signal that they transmitted hundreds of millennia ago.