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  1. 19893

    “Antibiotics in infancy tied to asthma” (SN: 7/7/07, p. 14) reported a correlation but no confident explanation for the relationship between receiving antibiotics and later developing asthma. This article, which reports that children with Helicobacter pylori in their stomachs are less likely to get asthma, seems to offer a convincing answer. Virginia BrockRock Island, Ill.

    By Science News
  2. 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

  3. 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.