So, I was just wondering, I know you're a professor of history, but I'm just wondering, what's the picture of everything going on in the world today? And, in the future, all the climate change, the cost of the weather, everything that we do is going to be affected. And, if you think about it, what can we do that would stop the disease? I don't know, but I think it's a pretty simple question that I can answer.