Discussing Fundamental Principles (aka Groundwork) of the Metaphysic of Morals (1785).
We try very hard to make sense of Kant's major ethical principle, the Categorical Imperative, wherein you should only do what you'd will that EVERYONE do, so, for instance, you should not will to eat pie, because then everyone would eat it and there would be none left for you, so too bad.
Also, Kant on free will, "things in themselves," our duties to animals, and prostitution! Plus: Should you go to grad school?
End song: "Stop" by Madison Lint (2003).