 So I've looked at the last 100,000 years, and there appear to have been four previous pole locations over the last 100,000 years. So before the Arctic, it was Hudson Bay. Before that, it was Norwegian Sea. Before that, it was Greenland, northern Greenland. And before that, it was the Bering Sea. And these locations correlate with climate changes in different parts of the world. And again, I talk about that in my books and these papers, and they're available online.