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  1. Humans

    It’s time to reform work hours for resident physicians

    A Harvard Medical School physician and sleep researcher says rules should be changed to make sure physicians-in-training get the sleep they need.

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  2. Space

    Moon crash delivers no obvious plume

    But the two impacts still yield data that could help in search for water

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  3. Space

    Ice confirmed on an asteroid

    Reporting from the American Astronomical Society meeting in Puerto Rico, planetary scientists confirm, for the first time, the presence of frozen water on an asteroid.

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  4. Life

    Circadian clockwork takes unexpected turns

    Some neurons in the brain’s master clock fall silent in the afternoon.