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  1. Health & Medicine

    Not all strep infections are alike and it may have nothing to do with you

    Add-on genes in some bacteria shape the way strains interact with the immune system.

    By Laurel Hamers
  2. Planetary Science

    Shallow ice sheets discovered on Mars could aid future astronauts

    Exposed water ice on steep Martian slopes suggest there’s a lot within a meter or two of the surface.

    By Lisa Grossman
  3. Planetary Science

    Hubble telescope ramps up search for Europa’s watery plumes

    Astronomers are redoubling their efforts to confirm that the icy moon Europa spews water from its south pole.

    By Lisa Grossman
  4. Neuroscience

    Protein helps old blood age the brains of young mice

    Increased levels of one protein in old blood may contribute to its aging effects on the brain, a mouse study suggests.