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  1. Humans

    Simple water filter can nail arsenic

    Field tests suggest that people who live in areas with arsenic-tainted aquifers may be able to purify their drinking water by passing it through a low-tech, low-cost filter that includes a bed of iron nails.

    By Sid Perkins
  2. Earth

    Killer weather on Mount Everest

    An analysis of weather patterns around Mount Everest in May 1996, when eight climbers died, suggests that a sudden drop in barometric pressure may have played a significant role in the deaths.

    By Sid Perkins
  3. Health & Medicine

    Breast milk may lower cholesterol

    Feeding a newborn baby breast milk instead of formula during the first month of life improves the child's cholesterol readings later on.