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  1. Climate

    Rising CO2 in lakes could keep water fleas from raising their spiky defenses

    Rising CO2 in freshwaters may change how predators and prey interact in lakes.

    By Carolyn Gramling
  2. 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
  3. 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
  4. 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.