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  1. Health & Medicine

    New test could discern serious condition early after bone marrow transplant

    Protein level in blood reveals graft-versus-host disease, may indicate severity of this complication

    By Nathan Seppa
  2. Earth

    Footprints could push back tetrapod origins

    Newly discovered trackways much older than previous evidence for sea-to-land transition.

    By Sid Perkins
  3. Life

    Moss counters shortness with A-bomb-style clouds

    Sphagnum overcomes drag by launching its spores in vortex rings.

    By Susan Milius
  4. Space

    Comets don’t all start out on the fringe

    A new model suggests that comets also come from the inner Oort Cloud and offers a way to resolve a massive problem about the early solar system.