Since I first started homeschooling, no, since I was a child, I've learned there's an emotional content to learning. If you're enjoying yourself when you're learning the content is not only more likely to stick with you, it's more likely that you'll seek out similar learning opportunities. If you're worried, uncomfortable, stressed, upset, etc., then what you'll remember is the feelings you had, very little of the content, and you'll be less likely to seek out similar situations.
Well, duh! Of course, you say? But traditional education hasn't taken notice, until now! Yea. Maybe there's hope for schooled kids of a classroom that pays as much attention to the emotional content as to the academic content.