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  1. Salmonella illnesses traced to pet rodents

    Hamsters and other pet rodents are probably underappreciated spreaders of salmonella bacteria.

    By Ben Harder
  2. Earth

    2006: Hottest year in U.S. history

    Preliminary analyses of weather data gathered from more than 1,200 sites across the continental United States indicate that last year was the warmest on record.

    By Sid Perkins
  3. Paleontology

    Of penguins’ range and climate change

    Variations in the range of Adélie penguins along one section of Antarctica's coast during the past 45,000 years are a keen indicator of climate change there.

    By Sid Perkins
  4. Health & Medicine

    Nanoparticles find tumors, form clumps

    Newly designed nanoparticles could have dual benefits in the fight against cancer.