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  1. Animals

    Lemurs’ group size predicts social intelligence

    Primates that live with many others know not to steal food when someone is watching.

    By Cristy Gelling
  2. Health & Medicine

    A wobble of the noggin reveals the workings of the heart

    Pulse can be measured by examining a video of subtle head motions.

    By Meghan Rosen
  3. Humans

    Hard throwers evolved a long time ago

    Baseball hurlers provide clues to the ancient roots of bodies that can heave objects really fast.

    By Bruce Bower
  4. Animals

    Elephant diets changed millions of years before their teeth

    The animals fed on grasses long before their molars could grind the tough plants.