1. Melting sea ice in Barrow, Alaska

    Radical idea could restore ice in the Arctic Ocean

    Windmill-powered pumps on buoys throughout the Arctic Ocean could help bring back shrinking sea ice, researchers say.

  2. Pluto
    Planetary Science

    It’s time to redefine what qualifies as a planet, scientists propose

    Astronomers can have their definition of a planet, but some planetary scientists plan to stick to the long-held meaning of the word.

  3. penicillin rash
    Health & Medicine

    Penicillin allergy? Think again.

    Most people are either mislabeled with a penicillin allergy or get over it with time, and doctors don’t always think to check.