I love that emphasis on history. I get fascinated by this guy on Twitter who will he does it to help us think more critically about history. What's been some of the biggest surprises for you as some of this was new for you and also for the students what life looked like without a technology? Oh, that's a good question. I think the biggest surprise for the students was discovering that we have had some environmental issues that we solved. And then recently when we did material sciences seeing how much devastation of the forests we had created in the 17800s.