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

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

A theory has only the alternative of being right or wrong. A
model has a third possibility: it may read more

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

We all agree that your theory is crazy, but is it crazy enough?

We all agree that your theory is crazy, but is it crazy enough?

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

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