• All interesting issues in natural history are questions of relative frequency, not single examples. Everything happens once amidst the richness of nature. But when an unanticipated phenomenon occurs again and again—finally turning into an expectation—then theories are overturned.

    Stephen Jay Gould (1990). “Wonderful Life: The Burgess Shale and the Nature of History”, p.136, W. W. Norton & Company
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