Stop me if you’ve heard this one before. Actually, don’t. There’s value in repetition, and more than I think most people realize. This isn’t about the benefits of active recall or spaced repetition. It’s about how hearing things shapes your attention. When someone tells you something that you already know, you aren’t learning something new. But you are devoting mindshare to thinking about the thing. And they’re telling you about the thing for a reason. So, spending a little mind...