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  1. Paleontology

    Reptilian Repast: Ancient mammals preyed on young dinosaurs

    Two nearly complete sets of fossilized remains from 130-million-year-old rocks are revealing fresh details about the size and dietary habits of ancient mammals, hinting that some of these creatures were large enough to feast on small dinosaurs.

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  2. 19503

    The model for the emergence of a population of “cheaters” out of a population of “cooperators” described in this article gives a fresh viewpoint on existing ecosystems—and much more. Might the evolution of asymmetric modern sex from symmetric DNA exchange (like that practiced by paramecia) have been one special case of this emergence? If so, […]

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  3. Math

    When Laziness Pays: Math explains how cooperation and cheating evolve

    Researchers have developed a mathematical model that helps explain how cooperation and cheating evolve among simple organisms.