Feature

  1. Humans

    Year in Review: New discoveries reshape debate over human ancestry

    Human evolution appears poised for a scientific makeover as the relationships among early hominids are disputed.

    By Bruce Bower
  2. Cosmology

    Year in Review: Planck refines cosmic history

    The satellite data hint at a slower expansion rate for universe.

    By Andrew Grant
  3. Life

    Year in Review: Bioengineers make headway on human body parts

    New techniques produce mimics of brain, liver, heart, kidney, retina.

    By Meghan Rosen
  4. Life

    Year in Review: Your body is mostly microbes

    Microbiome results argue for new view of animals as superorganisms.

    By Tina Hesman Saey
  5. Science & Society

    Top 25 stories of 2013, from microbes to meteorites

    This year, careful readers may have noticed a steady accumulation of revelations about the bacterial communities that call the human body home.