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  1. Humans

    Math clubs get national sponsor

    A math group is offering all U.S. middle schools free materials to set up clubs aimed at making math fun.

    By Janet Raloff

  2. Stored blood loses some of its punch

    Loss of nitric oxide from donated blood that's been stored for as little as 3 hours could impair its ability to flow through a recipient's blood vessels.

    By Nathan Seppa
  3. Materials Science

    Polymer could improve natural gas purification

    A new polymer membrane that efficiently separates carbon dioxide from methane could greatly ease the processing of natural gas.

    By Alexandra Goho
  4. Astronomy

    Record-breaking supernova

    A newly discovered supernova, 100 billion times as bright as the sun, is the most luminous ever recorded.