necktie. The book he was reading was Langmuir's Social History of the American People—not one of my favorites, a bit too much on the doctrinaire side, but what a bookshop clerk would give a foreigner looking for something to explain America. "What do you think, Professor?" the plump man was asking me. "It would work out the other way. The differences wouldn't cancel out; they'd accumulate. Say something happened a century ago, to throw a presidential election the other way. You'd get different people at the head of the government, opposite lines of policy taken, and eventually we'd be getting into different wars with different enemies at different times, and different batches of young men killed before they could marry and have families—different people being born or not being born. That would mean different ideas, good or bad, being advanced; different books written; different inventions, and different social and economic problems as a consequence." "Look, he's only giving himself a century," the colonel added. "Think of the changes if this thing we were discussing, Columbus sailing under the English flag, had happened. Or suppose Leif Ericson had been able to plant a permanent colony in America in the Eleventh Century, or if the Saracens had won the Battle of Tours. Try to imagine the world today if any of those things had happened. One thing you can be sure of—any errors you make in trying to imagine such a world will be on the side of over-conservatism." The sandy-haired man beside me, who had been using his highball for a crystal ball, must have glimpsed in it what he was looking for. He finished the drink, set the empty glass on the stand-tray beside him, and reached back to push the button. "I don't think you realize just how good an idea you have, here," he told the plump man abruptly. "If you did, you wouldn't ruin it with such timid and unimaginative treatment." I thought he'd been staying out of the conversation because it was over his head. Instead, he had been taking the plump man's idea apart, examining all the pieces, and considering what was wrong with it and how it could be improved. The plump man looked startled, and then angry—timid and unimaginative were the last things he'd expected his idea to be called. Then he became uneasy. Maybe this fellow was a typical representative of his lord and master, the faceless abstraction called the Public. "What do you mean?" he asked.