Nature discloses the secrets of her past with the greatest reluctance. We paleontologists weave our tales from fossil fragments poorly preserved in incomplete sequences of sedimentary rocks. Most fossil mammals are known only from teeth—the hardest substance in our bodies— and a few scattered bones. 99

From "History of the Vertebrate Brain," from Ever Since Darwin: Reflections in Natural History, by Stephen Jay Gould. Copyright © 1973,1974,1975,1976,1977 by the American Museum of Natural History; copyright © 1977 by Stephen Jay Gould. Reprinted by permission of W.W. Norton & Company Inc.,

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