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The Limits Myth - Is There a Limit?
Until we find a genuinely independent biosphere this has to remain, in a sense, a hypothesis. But i think it's really quite difficult to think of things which have only evolved once. If you think about all possible alternatives in a biological system the numbers turn out to be staggeringly big. We're dealing with truly immense numbers. Ten to the 210 to 200, these 250, these are unimaginably gigantic spaces, so to speak.