No precautions, and no precautionary principle, can avoid problems that we do not yet foresee. We need a stance of problem-fixing, not just problem-avoidance.

Feeling insignificant because the universe is large has exactly the same logic as feeling inadequate for not being a cow.

The overwhelming majority of theories are rejected because they contain bad explanations, not because they fail experimental tests.

Every problem that is interesting is also soluble.

The truly privileged theories are not the ones referring to any particular scale of size or complexity, nor the ones situated at any particular level of the predictive hierarchy - but the ones that contain the deepest explanations.

I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.

Our best theories are not only truer than common sense, they make more sense than common sense...