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  1. Earth

    Top of Everest is an ozone overdose

    Wafts from lower atmosphere, polluted regions bathe the peak in amounts that exceed EPA limits.

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  2. Health & Medicine

    Epigenetics reveals unexpected, and some identical, results

    One study finds tissue-specific methylation signatures in the genome; another a similarity between identical twins in DNA’s chemical tagging.

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  3. Life

    Darwin’s natural selection redefined the idea of design

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  4. Health & Medicine

    Neural paths for borderline personality disorder

    A new brain-imaging study indicates that unusual neural activity linked to emotion, attention and conflict-resolution systems underlies a common psychiatric condition known as borderline personality disorder.