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  1. Earth

    Night lights may foster depression

    In animals, chronic dim light triggers brain changes that disappear with the return of nightlong darkness.

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  2. Space

    Crowd sourcing comes to astronomy

    Researchers comb the Internet for snapshots of a comet and use the collected images to calculate its orbit.

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  3. Life

    Polar bears’ ancient roots pushed way back

    Full genetic blueprints suggest the animals split from brown bears millions of years ago.

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  4. Earth

    Earth scientists think it’s time to sync their geological clocks

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  5. Animals

    Tiny creature, giant sperm

    Giant sperm appear in various other species, including some flatworms, beetles and a fruit fly species, Drosophila bifurca, with sperm nearly 6 centimeters long.