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Are Republicans and Democrats driven by hatred of one another? Less than you think

Rather than being fueled by animosity for the other side—negative partisanship—a new study finds that Americans are at least as motivated by the passion they have for their own party.

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  • Exposure to air pollution worsens Alzheimer’s disease
    Emissions from a power plant.

    Image: Pencho Chukov via Getty Images

    Exposure to air pollution worsens Alzheimer’s disease

    New research from Penn Medicine finds living in areas with high concentration of air pollution is associated with increased buildup of amyloid and tau proteins in the brains of Alzheimer’s patients, accelerating cognitive decline.

    Sep 9, 2025