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China’s national security law for Hong Kong, explained

Director of the Center for the Study of Contemporary China Jacques deLisle weighs in on the ongoing tensions between Hong Kong and mainland China.
Colorful umbrellas gathered on street
A scene of protests from August 2019. Umbrellas have been used in protests to block tear gas and become symbolic among Hong Kong protesters. 

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    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

    What stiffening lung tissue reveals about the earliest stages of fibrosis
    Donia Ahmed prepares tissue for imaging.

    Image: Courtesy of Penn Engineering Today

    What stiffening lung tissue reveals about the earliest stages of fibrosis

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    Sep 12, 2025