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  1. Astronomy

    Massive black hole lurks in lightweight galaxy

    A heavyweight black hole grew to weigh as much as 7 billion suns within the first 2 billion years after the Big Bang.

    By Christopher Crockett
  2. Earth

    Natural concrete keeps lid on Italian volcano

    Naturally occurring, concretelike rock allows the ground around Italy’s Campi Flegrei caldera to bulge without bursting.

    By Thomas Sumner
  3. Tech

    3-D–printed body helps jumping robot land on its feet

    To launch itself into the air, a jumping robot relies on a 3-D–printed body made of a gradient of soft and stiff plastics.

    By Meghan Rosen
  4. Animals

    Giant pandas live in the slow lane

    Giant pandas burn far less energy than similarly sized land mammals.