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  • Ultrasonic Evolution

    Ultrasonic Evolution

    Image of the Week

    The inner ear of a 13-million-year-old shark-toothed dolphin.

  • Jurassic Mammal Teeth

    Jurassic Mammal Teeth

    Image of the Week

    A three-dimensional model of a fossilized jaw from a mouse-sized mammal that lived during the Jurassic Period.