1. Earth

    Algae do battle with bioweaponry

    Beneath the frozen surface of Sweden's lakes, algae wage wars over nutrients, and one combatant apparently prevails by releasing chemicals toxic to its adversaries.

  2. Earth

    Toxic Pfiesteria inhabit foreign waters

    The notorious Pfiesteria microbes, implicated in fish kills and human illness along the mid-Atlantic U.S. coast, have turned up in Norway.

  3. Earth

    Earth’s inner core could include silicon

    Laboratory experiments investigating the crystal structure of iron-silicon alloys at high temperatures and pressures may yield new insights into the mineral composition of Earth's core.

  4. Earth

    Finding fault for an old earthquake

    Scientists in Southern California believe they've found evidence that finally identifies the source of one of the region's largest quakes, a magnitude 7-plus temblor that struck the area on Dec. 21, 1812.

  5. Earth

    Satellites could help track sea level

    Experiments that used signals from Global Positioning System satellites to precisely measure altitude above a lake's surface may pave the way for fleets of spaceborne sensors that can quickly and inexpensively monitor local and global changes in sea level.

  6. Earth

    Beefy Losses

  7. Earth

    Bolts from the blue can have long reach

    Current U.S. Air Force operating procedures recommend personnel stop working outdoors when lightning is spotted within 5 nautical miles, but a new analysis suggests that this distance may not be adequate to fully protect aircraft and ground crews.

  8. Earth

    Southeastern Alaska is on the rebound

    Scientists using the Global Positioning System to track ground movement along faults in southeastern Alaska have measured something entirely different—the rapid rise of parts of the region due to the recent melting of glaciers.

  9. Earth

    Global warming to boost cotton yields

    The increase of carbon dioxide expected in the coming decades may boost cotton yields up to 26 percent, new models predict.

  10. Earth

    Toxic metals taint ancient dust

    A new study of dust lofted to Antarctica suggests that excess amounts of trace metals coated dust grains long before human industrial activity began loading the atmosphere with pollutants.

  11. Earth

    Turbulence leads to early rain of ash

    A new aerodynamic analysis suggests that chaotic turbulence in a high-altitude cloud of volcanic ash can cause small particles of the ash to clump together and fall to the ground much closer to the volcano than expected.

  12. Earth

    Hormones: Here’s the Beef

    Runoff of the hormones excreted by steroid-treated livestock could subtly harm aquatic life.