Epistemic status: homework assignment. I wrote this in an hour or so (probably frantically, minutes before the deadline) and it is not up to my usual quality standards (prof had no critical feedback but that’s a very low bar). It may or may not be useful to anyone, but there’s a reason this site is at unoriginal.blog. These are mainly published so I can cite them in other articles. Corrections are especially welcome here—send to contact@unoriginal.blog.