"Oh wow," Tom said, his eyes lighting up as he saw the ring. Before he got around to add more, a question was asked and the scientist kicked in. "Oh, yeah, they open to a random place. Well, not quite random. Sometimes it's random but most of the time it's connected to a world one of us comes from. The times vary and even the realities. It's quite mad. We've been to Spain in the 1920s. A destroyed New York." One he would rather forget about. "But you should see it. The earth - how beautiful it was once before all the pollution. So green... so full of life."