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  1. Health & Medicine

    Lack of nutrient turns flu nasty

    A dietary deficiency in selenium, an essential trace mineral, may cause a usually harmless strain of the flu to mutate into a virulent pathogen.

    By Ben Harder
  2. Health & Medicine

    New human virus tied to obesity

    Researchers have identified the second member of a class of human viruses that may increase people's susceptibility to obesity.

    By Ben Harder
  3. Physics

    Magnetism piece fits no-resistance puzzle

    Experimenters have found evidence that a type of magnetic behavior correlated with the onset of zero electrical resistance in some so-called high-temperature superconductors is generic to the whole class of those materials, yielding a possible clue to how the substances lose their resistance.