design is not the only alternative. There are also physical necessity and chance. The key to inferring that design is the best explanation will be eliminating these other two alternatives. Accordingly, we can present a very simple three-step argument: 1. The fine-tuning of the universe is due to either physical necessity, chance, or design. 2. It is not due to physical necessity or chance. 3. Therefore, it is due to design. This is a logically valid argument whose conclusion follows necessarily from the two premises. So the only question is whether those premises are more plausibly true than
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