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  1. Health & Medicine

    Defining normal in the brain

    A new growth curve paves way for scans to be used to spot early signs of autism, schizophrenia or other disorders.

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  2. Space

    Mars shows signs of recent activity

    The surface of Mars had abundant liquid water as well as volcanic activity during the past 100 million years, a new study of the Martian atmosphere suggests.

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  3. Math

    Crowdsourcing peer review

    MATH TREK: A claimed proof that P≠NP spurs a massive collaborative research effort.

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  4. Health & Medicine

    A cellular secret to long life

    Longevity may depend in part on histones, proteins that keep DNA neatly spooled in the cell’s nucleus and help regulate gene activity.