Barry laughed shortly. "Tansie Lee? She is none of my crowd; she's a weak-minded sitter on the temporal fence, Ackerman. She believes that both worlds can be saved." "Well, can't they?" "Oh, now look, Ackerman, you're not the same kind of wishy-washy creature. Life is a struggle always. Kill or be killed still works—and always will." "Just destruction for the sake of," said Ackerman harshly, "is untenable—even though you indulge in self-justification by believing that life is always kill or be killed." "Let's face it," said Barry Ford. "Before your perilous experiment, we had a single world, with a single 'future'. You caused fission of 'time'. The twin existances are starting to converge again; the energy used in splitting 'time' is dissipating and as it is converted, the 'time-streams' converge. But they have not been the same world for hundreds of years. What will happen when suddenly the solar system contains two suns, two earths, and two of each planet? The sky will be filled with double stars where single stars once were, and quadruple stars where doubles now exist. Some, that have not moved far from one another in their contingent existances, will find one another occupying the same 'space'! See?" Ackerman scowled uncertainly. "It looks to me as though we're scheduled for a big blast anyway." Ford shook his head with a slight smile. "Nope," he said. "Not at all; you see, Ackerman, there is only one thing that tends to draw the coincident existances together. One force against the fissioning force of your little experiment. If we can destroy that force, the twin lives will continue to drift apart." "And that force?" "That force, Ackerman, is the physical energy of the human mind!" "Uncontrolled? What is the affinity?" Barry bit his lip and shrugged. "Human cussedness," he said. "Why, fundamentally, are you a brilliant physicist?" "I'm not; and I've been called that by too many people." "You are and we'll pursue the question. Why?" Ackerman grinned. "Just apelike curiosity," he said. "I like to know what makes things tick."