Uncategorized

  1. Physics

    Realistic Time Machine? New design could forgo exotic ingredient

    A novel time machine concept may avoid a problem of earlier, less-practical proposals by requiring only normal matter and the vacuum known to exist in space.

    By Peter Weiss
  2. Earth

    Pollution Ups Blood Pressure: Inhaled particles linked to transient effect

    In a laboratory setting, volunteers breathing pollutants generated by sources such as vehicle engines experience slight but steady increases in blood pressure.

    By Ben Harder
  3. Earth

    Arctic Foulers: Foraging seabirds carry contaminants home

    When seabirds go out looking for food, they can bring home traces of pollutants that build up around their nesting colonies.

    By Susan Milius
  4. Earth

    Power-laden winds sweep North America

    There's more than enough wind power to satisfy the United States' energy requirements, a new analysis of weather data suggests.