I wrote these essays while I was teaching a class with this title. I'm posting them here for your entertainment. You may use them for individual or non-profit adventures. You must include my copyright and you may not pass them off as your work or for your profit. As you can see, these are drafts of chapters I hope to include in a book. Those near the beginning have had more work (Chapters 1-10); those near the end are still very much class notes.