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  1. Life

    Chicken cells have strong sense of sexual identity

    In birds, hormones may not be the last word in determining males and females.

    By Susan Milius
  2. Life

    Evolutionary genetic relationships coming into focus

    Researchers have filled in about 40 percent of the tree of life for mammals and birds, but other vertebrates lag behind.

    By Rachel Ehrenberg
  3. Health & Medicine

    Cocktails ward off the bulge

    A large study has found that middle-aged women who drink moderately gain less weight over the years compared to their teetotaling peers.

    By Laura Sanders
  4. Climate

    Ancient Norse colonies hit bad climate times

    Temperatures in Iceland plummeted soon after settlers arrived, a new chemical analysis suggests.