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  1. Health & Medicine

    Alzheimer’s drug shows staying power

    The drug memantine slowed mental decline in people with moderate-to-advanced Alzheimer's disease in a 12-month trial, the longest test of the drug to date.

    By Nathan Seppa
  2. Earth

    Krakatoa stifled sea level rise for decades

    Ocean cooling caused by the volcanic eruption of Krakatoa in 1883 kept sea level worldwide in check well into the 20th century.

    By Sid Perkins
  3. Planetary Science

    Stellar passage yields Charon’s girth

    By observing Pluto's moon Charon passing in front of a star, astronomers have obtained precise measurements of the moon's radius and density.

    By Ron Cowen
  4. Earth

    How to rate a snowstorm

    Scientists have developed a rating scale to assess the impact of major snowstorms that strike the northeastern United States.