I mean, when you get down to very low numbers of nuclear weapons, and you contemplate going to zero, how do you deal with the reality of that technology being available to almost any country that seeks to pursue it? And what conditions do you put in place?

Part of the problem is when we bring in a new technology we expect it to be perfect in a way that we don't expect the world that we're familiar with to be perfect.

Don't leave hold of your common sense. Think about what you're doing and how the technology can enhance it. Don't think about technology first.

The moment of drifting into thought has been so clipped by modern technology. Our lives are filled with distraction with smartphones and all the rest. People are so locked into not being present.

The laws of physics should allow us to arrange things molecule by molecule and even atom by atom, and at some point it was inevitable that we would develop a technology that would let us do this.