Physics, chemistry, and biology favor carbon based life. We have no reason to believe that any other combination of elements not centered on carbon can achieve spontaneous generation and evolve to sentient complexity. In competition with carbon based critters each will lose to the greater stability of the carbon based critters.
Our bias is reasonable.
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For those inclined to oppose human meddling with the structure of the universe or the composition and configuration of objects and groups of objects within the universe, consider:
Whether there is a limit to the magnitude of a modulation of chaos below which order remains invariant? Or, is order but a fiction invented by perspectives applied over finite, however large, time intervals?
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