Jacob Falkovich says that single people often seek out similarity when complementarity is what makes relationships cohere long-term. It’s a great observation. But how to operationalize it? Maybe: look for someone you can’t initially understand, but also don’t feel like walking away from.

There is a trope in romance that when you meet the person you are supposed to be with, you can talk about anything. You can apparently inverse that too: if you talk about anything that pops into your mind, you can tell if you're supposed to be with the person by judging their reaction.