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  1. Earth

    Symbionts affect coral’s chemistry

    The presence of symbiotic organisms in the tiny animals that build coral reefs changes the rates at which the animals take in minerals from the water, a finding that may affect the results of many research projects that have used chemical analyses of coral remains to infer past sea-surface temperatures.

    By Sid Perkins
  2. Astronomy

    Elliptical duet rides the Kuiper belt

    Follow-up observations of an icy object in the Kuiper belt and its moon reveal that the two bodies revolve about each other in the most elongated orbit of any pair of objects in the solar system.

    By Ron Cowen
  3. Health & Medicine

    Virus gives cancer the cold treatment

    A genetically engineered version of a common cold virus appears to kill cancer cells without harming healthy tissue.