 Now, some people are going to laugh at that, meaning economics can be thrilling. Well, that was the whole point, that about 20 or 25 or 30 years ago, I got finding that found that a lot of my students weren't reading the textbook, not written by me, but that I assigned. They were telling me it's boring. And I thought, is there something I could do that would teach economics, but it would be fun to teach? So actually, my wife and I have collaborated on these. We've got this is the fourth.