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  1. Astronomy

    Maverick asteroid might be an immigrant from outside the solar system

    A space rock’s backward orbit could be a hint of unusual origins.

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  2. Health & Medicine

    What we know about the Ebola outbreak, and the vaccine that might help

    Even as an experimental vaccine arrives in Congo to contain the virus, there are worrisome signs Ebola has spread to a city.

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  3. Health & Medicine

    The CDC advises: Don’t swallow the water in a hotel swimming pool

    In a 15-year period, hotel swimming pools and water parks had the highest number of swimming-related disease outbreaks in the United States.

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  4. Earth

    Keeping global warming to 1.5