News

  1. Planetary Science

    Scientists probe fresh Martian meteorite 

    Rock holds clues to Red Planet’s atmosphere and surface conditions.

    By Tanya Lewis
  2. Health & Medicine

    Tomato compound might prevent some strokes

    Men with high blood concentrations of lycopene are less vulnerable, a study finds.

    By Nathan Seppa
  3. Life

    Thyroid in a dish

    Stem cells assemble themselves into a working gland.

    By Tina Hesman Saey
  4. Animals

    Early arthropod had a fancy brain

    A 520-million-year-old fossil of a segmented animal shows that sophisticated central nervous systems are surprisingly ancient.

    By Erin Wayman
  5. Chemistry

    Depths hold clues to dearth of xenon in air

    The gas doesn’t dissolve well in minerals deep inside Earth, a discovery that may explain why it’s also scarce in the atmosphere.