 And it's a zone of weakness and unusual rock types develop along it. And there have been some very destructive quakes going back into colonial times. And, of course, you mentioned Pennsylvania. You know, they had a couple of 4.6s just about two years ago near Harrisburg. Surprised everybody. The largest quake in the history of Pennsylvania. And at one point I had a list of 12 earthquakes that had been centered in Pennsylvania. All 12 of them fit my window theory.