Mathematics is a language. We want scientists to be able to read it, speak it, and write it. But we are are not training them to be grammarians.

The aim ... is to provide a clear and rigorous basis for determining when a causal ordering can be said to hold between two variables or groups of variables in a model . . . . The concepts refer to a model-a system of equations-and not to the 'real' world the model purports to describe.

Maybe we ought to have a world in which things are divided between people kind of fairly.

Human knowledge has been changing from the word go and people in certain respects behave more rationally than they did when they didn't have it. They spend less time doing rain dances and more time seeding clouds.

Everyone designs who devises courses of action aimed at changing existing situations into preferred ones.

Forget about Nobel prizes; they aren't really very important.

Mathematics is a language. We want scientists to be able to read it, speak it, and write it. But we are are not training them to be grammarians.