“But that can’t work, can it?” said Richard. “If we do that, then this won’t have happened. Don’t we generate all sorts of paradoxes?” Reg stirred himself from thought. “No worse than many that exist already,” he said. “If the Universe came to an end every time there was some uncertainty about what had happened in it, it would never have got beyond the first picosecond. And many of course don’t. It’s like a human body, you see. A few cuts and bruises here and there don’t hurt it. Not even major surgery if it’s done properly.”