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  1. Tech

    Reaching for Rays

    Harnessing the sun's rays cheaply and efficiently could address the planet's energy needs.

    By Aimee Cunningham
  2. Health & Medicine

    Dangerous History

    The genome of the TB bacterium has small but significant pockets of diversity, giving scientists new targets for preventing and treating the disease.

    By Emily Sohn
  3. Math

    Covering New Ground with Polygons

    Mathematicians can cover larger areas than they'd realized using polygons with fixed diameters.

    By Julie Rehmeyer
  4. Humans

    Letters from the May 26, 2007, issue of Science News

    It’s cold out there I couldn’t help noticing the last sentence of “World’s climate map gets an update” (SN: 3/24/07, p.