Here’s a fun little thought-experiment, derived from the work of Ernest Gellner. Try jotting down a list of all the things you love about your partner, if you have one. (If you don’t, try to picture your perfect beloved. If you’re just not into romantic love at all, sit back and enjoy what we’re about to do to the concept.) Don’t panic if you find making this list harder than you think it should be. How do you sum up somebody you love in just a few adjectives? It almost feels like a...