There are certain things that are inherently scarce. For example, there is only a certain amount of beachfront property in California. It is going to be scarce, it is going to be expensive.

Machines built by human beings they will function correctly if we provide them with a very specific environment. But if that environment is changed they won't function at all.

Because of technological limits, there is a certain amount of food that we can produce per acre. If we were to have intensive greenhouse agriculture, we could have much higher production.

One of the things that we can say with confidence is that we will have much lighter, much stronger materials, and this will reduce the cost of air flight, and it will reduce the cost of rockets.

We see an entire planet which has many limitations.

Nanotechnology is an idea that most people simply didn't believe.

We are looking at a future where to a first approximation everyone is wealthy.