We've got to put a lot of money into changing behavior.

If I only had two dollars left I would spend one dollar on PR.

We're focused on providing innovations in software, driving the continuous improvement for a much better experience, and there's a lot going on here that speaks to this decade and what's going to happen in this decade. We can kind of sum it up in terms of saying, "Yes, you can."

Software is definitely engineering. It's different in that we take on novel tasks every time. It's not like building a certain bridge that is virtually identical to some previous bridge or some previous building.

There certainly is a case to be made that taxes should be more progressive.

When I say "miracle" I mean a kind of thing like a computer on a chip, or the internet, or the cellphone, that are really quite miraculous. Most people would not have predicted them, and their effect has been very, very dramatic.

The nuclear approach I'm involved in is called a traveling-wave reactor, which uses waste uranium for fuel. There's a lot of things that have to go right for that dream to come true - many decades of building demo plants, proving the economics are right. But if it does, you could have cheaper energy with no CO2 emissions.