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A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

Sometimes a scream is better than a thesis.

In theory, there is no difference between theory and practice. But, in practice, there is.

A theory has only the alternative of being right or wrong. A model has a third possibility - it may be right but irrelevant.