"Under no circumstances must we touch land belonging to fellahs or worked by them. Only if a fellah leaves his place of settlement, should we offer to buy his land, at an appropriate price."

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Since the universe must contain millions of appropriate planets, consciousness in some form - but not with the paired eyes and limbs, and the brain built of neurons in the only example we know - may evolve frequently. But if only one origin of life in a million ever leads to consciousness, then Martian bacteria most emphatically do not imply Little Green Men.

— Stephen Jay Gould