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  1. Physics

    The Ultimate Clock

    Keeping precise time on the universe’s scale.

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  2. Astronomy

    A Shadowed Past

    Understanding of moon’s earliest days gets even murkier.

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  3. Life

    When snowpack shrinks, elk can binge on aspen

    As winters warm in the Rockies, majestic grazers may be threatening iconic Western tree.

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  4. Life

    Stem cell advance uses cloning

    A method that uses eggs to do genetic reprogramming is successful in humans.

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  5. Humans

    Inca takeovers not usually hostile

    Skeletal evidence suggests that war was not the answer for Inca imperialists.