Right. Perhaps I could go back to 1995 and a pivotal study. It was a control study involving n equals two, or two individuals. This was the Wittes and Saginur paper, which I remember reading then and was very struck by.
I'll have to expand on this a bit. This was a study where two geologists went to Tanzania. I'm sure you remember this. One of them was from Ottawa, in fact. They shared a tent for eight weeks. I think both geologists were in their forties. They were young and healthy guys. One of the geologists—