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  1. Health & Medicine

    Most football players who donated their brains to science had traumatic injury

    A self-selected sample of 202 deceased football players, the largest to date, finds that the majority suffered from chronic traumatic encephalopathy.

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  2. Health & Medicine

    Add penis bacteria to the list of HIV risk factors

    Certain bacteria found on the penis raise the risk of HIV infection, a new study finds.

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  3. Earth

    How earthquake scientists eavesdrop on North Korea’s nuclear blasts

    Researchers monitor the power and location of underground nuclear weapons testing by North Korea.

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  4. Astronomy

    ‘Making Contact’ chronicles an astronomer’s struggle to find E.T.