Unfortunately, all life on earth - the only life we know - represents, for all its current variety, the results of a single experiment, for every ear… - Stephen Jay Gould

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Unfortunately, all life on earth - the only life we know - represents, for all its current variety, the results of a single experiment, for every earthly species evolved from the common ancestry of a single origin. We desperately need a repetition of the experiment (several would be better, but let's not be greedy!) in order to make a judgement. Mars represents our first real hope for a second experiment - the sine qua non - for any proper answer for the question of questions.

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About Stephen Jay Gould

Stephen Jay Gould (September 10, 1941 – May 20, 2002) was an American geologist, paleontologist, evolutionary biologist and popular-science author, who spent most of his career teaching at Harvard University and working at the American Museum of Natural History in New York. He was one of the most influential and widely read writers of popular science of his generation.

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Our shenanigans, nuclear and otherwise, might easily lead to our own destruction in the foreseeable future. We might take most of the large terrestrial vertebrates with us—a few thousand species at most. We surely cannot extirpate 500,000 species of beetles, though we might make a significant dent. I doubt we could ever substantially touch bacterial diversity. The model organisms cannot be nuked into oblivion, or very much affected by any of our considerable conceivable malfeasances.

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