Dear Student,

Each study in this section is subject to revision as more is learned and discovered. Nothing herein bears the claim of perfection or a final word on the matter. Far from it. We are open to discussions and dialogues on any subject as long as courtesy and thoughtfulness is employed by any respondent. Reports of discovery of typos, grammatical errors, omissions, and things of this sort will be welcome. Honest questions or comments will be taken seriously. We strive for excellence and are willing to do the work to achieve it. We expect no less from those studying this material. Response to any harsh or demeaning comments will not be forthcoming.