However, theory teaching should not end with numbers and notations or some pedantically worded statements. The main messages of a theory should be conveyed to students in plain language. Writing the final formula followed by some number-crunching exercises is not the end. A "so what" question should be raised and answered. Students should be driven to appreciate the significance of the theory's implications in the real world. We should translate those unfriendly equations into layperson's language.