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  1. Health & Medicine

    Fullness Factor: Gut hormone tells brain the stomach is well fed

    A hormone produced by the intestines could be the primary satiety signal sent to the brain.

    By John Travis
  2. Astronomy

    Visible Matter: Once lost but now found

    New observations confirm that most of the visible matter in the universe lies hidden in vast, hard-to-detect gas clouds between galaxies.

    By Ron Cowen
  3. Plants

    Recent tree scourge poses garden threat

    Lab tests suggest that a lethal disease of oak trees in California and Oregon could strike some popular garden shrubs in the rhododendron family.

    By Susan Milius
  4. Plants

    Disease outpacing control in largest chestnut patch left

    An unusual test of a biological control for the blight that's killing American chestnuts doesn't look good in the largest remaining patch.