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  1. Life

    Fossil helps document shift from sea to land

    New fossils of an ancient, four-limbed creature help fill in the blanks of the evolutionary transition between fish and the first land-adapted vertebrates.

    By Sid Perkins
  2. Astronomy

    Impact may have transformed Mars

    Three teams suggest that a huge object slammed into Mars, giving the planet an unusually dualistic topography.

    By Ashley Yeager
  3. Plants

    Move it or lose it

    Climate change may have dire consequences for California’s native plants, which may need to take refuge in some the areas under pressure for development.

    By Rachel Ehrenberg
  4. Animals

    Don’t blame the guys

    Scientists take a new look at what drives female damselflies to look like males.