 Well, that's what we think now, but there's been a lot of debate during the past, I don't know, 100 years as to whether it was a clash between those two different populations or whether the farmers had already lived or disappeared. The farmers were also the people responsible for building all of these megaliths all over Northern Europe and in the UK as well. So we can see they're great monuments. They're still around. But all of a sudden, the people disappear and these megaliths, they also stop being built.