News

  1. Earth

    Bad Acid: Ocean’s pH drop threatens snail defense

    As ocean waters trend toward acidity, a result of atmospheric greenhouse gas buildup, a shoreline snail's defense against predatory crabs may weaken.

    By Susan Milius
  2. Planetary Science

    Portrait of a Martian crater

    An ultrasharp image of part of Mars' Gale crater shows waterborne sediments and volcanic ash.

    By Ron Cowen
  3. Health & Medicine

    Beware the Starlings: Common birds can carry avian influenza

    Common songbirds such as starlings may be able to carry and spread avian influenza.

    By Brian Vastag
  4. Physics

    Axion Gone: New tests find no sign of anomalous particle

    New experiments contradict earlier claims of the discovery of the axion, a possible constituent of cosmic dark matter.