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  1. Paleontology

    Northern Extinction: Alaskan horses shrank, then disappeared

    Horses that lived in Alaska shrank dramatically in body size before they went extinct at the end of the last ice age.

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  2. Astronomy

    Sound of the fury

    On Oct. 28, the Saturn-bound Cassini spacecraft recorded the radio wave "sound" of a powerful solar flare as it raced toward Earth.

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  3. Astronomy

    Chow Down! Milky Way gobbles its closest known neighbor

    A tiny, newly discovered galaxy being shredded by the gravity of the Milky Way is our galaxy's closest known neighbor, residing just 42,000 light-years from the Milky Way's center.

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  4. The good side of a viral infection?

    Hepatitis A infections may protect people from allergies and asthma.