 And so the one thing though that I think that is perhaps the hardest to understand until one has experienced this is it's not just that each person has read and I know it and I'm able to give them points for having read. It's the impact that happens when everyone has read that very difficult article. And you know not the instructor but every single student walks in that door that next morning, and they know that essentially everyone else had the same experience they had. And that creates the idealized classroom experience, because it means that we all are eager to start at this next level up, rather than having to require me to go through the basics they are ready to talk. They are ready to work they're ready to apply that information, and that's been the game changer for me completely, and why I've had this sort of new renaissance and a new love of teaching because of that. And you can imagine, and next slide please that when this happens just one classroom, and how 50 people, again that happened this semester just come out of it so excited as we finish our semester this week. This is just one classroom experience. Imagine if we could have this available to so many other classrooms, what kind of world could we start to create just through this wonderful and pretty easy to use tool of hypothesis. So thank you so much.