I never heard of any of them except Einstein, but I didn’t let on. He mentioned a few more, but I’ve put in all I can remember. Then he said, “Those little reptiles had tiny brains, maybe quarter-size, maybe even less, but they used it all – every hit of it. Their hones might not show it, but they were intelligent; intelligent as humans. And they were boss of all Earth.”

And then Joe came up with something that was really good. For a while I was sure that he had the professor and I was awfully glad he came out with it. He said, “Look, P’fessor, if those lizards were so damned hot, why didn’t they leave something behind? Where are their cities and their buildings and all the sort of stuff we keep finding of the cavemen, stone knives and things. Hell, if human beings got the heck off of Earth, think of the stuff we ’ d leave behind us. You couldn’t walk a mile without falling over a city. And roads and things.”

But the professor just couldn’t he stopped. He wasn’t even shaken up. He just came right back with, “You’re still judging other forms of life by human standards. We build cities and roads and airports and the rest that goes with us – but they didn’t. They were built on a different plan. Their whole way of life was different from the ground up. They didn’t live in cities. They didn’t have our kind of art. I’m not sure what they did have because it was so alien I couldn’t grasp it – except for their guns. Those would be the same. Funny, isn’t it. – For all I know, maybe we stumble over their relics every day and don’t even know that’s what they are.”