News

  1. Tests revise image of kangaroo rats

    An ecological study of kangaroo rats has revised thinking about how these desert dwellers cope with their stressful home.

    By Susan Milius
  2. Anthropology

    Fossil skull spurs identity dispute

    A dispute has broken out over whether a recently discovered, 7-million-year-old fossil skull represents the earliest known member of the human evolutionary family or an ancient ape.

    By Bruce Bower
  3. Earth

    Haze clears on sooty climate conditions

    The results of a new study suggest that soot plays a bigger role in regional climate changes than scientists had previously realized.

    By Jessica Gorman

  4. Chicken Rank: Hen social position shifts egg hormones

    A study of leghorn chickens has linked hormone concentrations in a hen's eggs to her rank in the pecking order.