A theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations.

Someone told me that each equation I included in the book would halve the sales.

If you understand how the universe operates, you control it in a way.

It [AI] would take off on its own and redesign itself at an ever increasing rate. Humans, who are limited by slow biological evolution, couldn't compete and would be superseded.

If the total energy of the universe must always remain zero, and it costs energy to create a body, how can a whole universe be created from nothing?

We think we have solved the mystery of creation. Maybe we should patent the universe and charge everyone royalties for their existence.

We don't let animals suffer, so why humans?