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  1. Paleontology

    Dinosaurs matured sexually while still growing

    Distinctive bone tissue in fossils of several dinosaur species suggests that the ancient reptiles became sexually mature long before they gained adult size.

    By Sid Perkins
  2. Paleontology

    Deinonychus’ claws were hookers, not rippers

    The meat-eating dinosaur Deinonychus probably used the large, sicklelike claw on its foot to grip and climb large prey, not disembowel it.

    By Sid Perkins
  3. Paleontology

    The first matrushka

    A newly found fossil preserves one creature inside another that lies nestled inside yet another, a Paleozoic version of the Russian nesting dolls known as matrushkas.

    By Sid Perkins
  4. Materials Science

    Printing scheme could yield 3-D photonic crystals

    An innovative printing scheme makes three-dimensional crystal structures that could be used to control the flow of light.