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  1. Animals

    The first land-walking vertebrates may have emerged from salty estuaries

    Early tetrapods were transitional creatures — not only between land and water, but also between fresh and salty environments.

    By Carolyn Gramling
  2. Paleontology

    Oldest known lizard fossil pushes group’s origins back 75 million years

    CT scan reveals hidden identity of an unusual lizard fossil found years ago in the Italian Alps.

    By Susan Milius
  3. Climate

    The first Americans could have taken a coastal route into the New World

    Alaskan glaciers retreated in time for ancient coastal entries of the first Americans.

    By Bruce Bower
  4. Science & Society

    The power of great editors, their lessons and legacy

    Editor in Chief Nancy Shute reflects on the history and legacy of Science News editors.