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  1. Tech

    Neutrons may spotlight cancers

    Researchers have taken a first step toward developing neutron beams as a medical diagnostic tool that might provide earlier detection of cancers.

    By Peter Weiss
  2. Materials Science

    Sea urchin shell lights the way for optical material

    Using the porous skeleton of a sea urchin as a template, materials scientists have fabricated a photonic crystal.

    By Alexandra Goho
  3. Agriculture

    Bees increase coffee profits

    Scientists studying a Costa Rican coffee farm have estimated the monetary value of conserving nearby wooded habitat for the bees that pollinate coffee plants.

    By Ben Harder
  4. Humans

    Letters from the August 21, 2004, issue of Science News

    Complex issue When cyanobacteria and plants transfer electrons photosynthetically, light is absorbed not by their photosynthetic proteins but by chlorophylls (“Protein Power: Solar cell produces electricity from spinach and bacterial proteins,” SN: 6/5/04, p.