Manufacturing Happy Citizens: How the Science and Industry of Happiness Control our Lives

And I think another thing, in terms of academics in the classroom, the value of going into a class and walking out of it, maybe tired, like, "Oh, that was a lot of work." But feeling like you really took something from it, like an accomplishment, like you literally just built something in your brain, like a new piece of knowledge, it's like, "Oh, yes." It's satisfying. It's an achievement.