“That’s Marx’s point,” my father replied. “Philosophy is dead. Philosophers come up with theories, one theory after the other, but they all contradict each other. There’s just no way of telling who is right and who is wrong. You should pick an exact science, something that can be verified or falsified, like chemistry or physics. Or pick a subject that gives you skills you can use to improve people’s lives. Like becoming a doctor or a lawyer—anything, really.”