Allowing for a lag of contagion from one nation to another, depending on how much their citizens intermingled, I'd give the rest of the world about twelve years. There was a long silence while Caswell probably drew the same graph in his own mind. Then he laughed weakly. "Well, you asked me for a demonstration." That was as good an answer as any. We got together and had lunch in a bar, if you can call it lunch. The movement we started will expand by hook or by crook, by seduction or by bribery or by propaganda or by conquest, but it will expand. And maybe a total world government will be a fine thing--until it hits the end of its rope in twelve years or so. What happens then, I don't know. But I don't want anyone to pin that on me. From now on, if anyone asks me, I've never heard of Watashaw. End of Project Gutenberg's The Snowball Effect, by Katherine MacLean