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  1. Earth

    Iron to blame

    Typhoons that drench Madagascar and spill iron-rich runoff into the Indian Ocean account for that region's massive but sporadic algal blooms.

    By Sarah Williams
  2. Animals

    Tough-guy bluebirds need a frontier

    As western bluebirds recolonize Montana, the most aggressive males move in first, paving the way for milder-mannered dads to take over.

    By Susan Milius
  3. Physics

    Hot stuff

    A plasma-based amplifier bumps up a laser's intensity by an unprecedented 20,000 times.

    By Davide Castelvecchi
  4. Planetary Science

    Neptune’s balmy south pole

    Neptune's south pole is about 10°C warmer than any other place on the planet.

    By Ron Cowen
  5. Plants

    Stalking the Green Meat Eaters

    Pitcher plants in a New England bog hold little ecosystems in their leaves, and also act as indicators of the bog's ecological health.