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What craigslist can teach us about Web 2.0

In a new book, Annenberg’s Jessa Lingel views modern online life through the lens of a site that hasn’t changed much in look or feel since it began 25 years ago.
A person standing in a library stack, with shelves of books on either side.
Jessa Lingel, an assistant professor at the Annenberg School for Communication.

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  • Nanoparticle blueprints reveal path to smarter medicines
    Hannah Yamagata, Research Assistant Professor Kushol Gupta and postdoctoral fellow Marshall Padilla, holding 3D-printed models of nanoparticles in a lab.

    (From left) Doctoral student Hannah Yamagata, research assistant professor Kushol Gupta, and postdoctoral fellow Marshall Padilla holding 3D-printed models of nanoparticles.

    (Image: Bella Ciervo)

    Nanoparticle blueprints reveal path to smarter medicines

    New research involving Penn Engineering shows detailed variation in lipid nanoparticle size, shape, and internal structure, and finds that such factors correlate with how well they deliver therapeutic cargo to a particular destination.

    Nov 12, 2025

    Monumental sculpture celebrated on Penn’s campus
    The Rui Rui sculpture on campus.

    nocred

    Monumental sculpture celebrated on Penn’s campus

    A generous gift from alumni Glenn and Amanda Fuhrman brings the work of internationally acclaimed artist Jaume Plensa to the University of Pennsylvania. The latest addition to the Penn Art Collection expands Philadelphia's public art.

    Nov 11, 2025

    A massive chunk of ice, a new laser, and new information on sea-level rise
    A researcher walking through a glacier in Greenland.

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    A massive chunk of ice, a new laser, and new information on sea-level rise

    For nearly a decade, Leigh Stearns and collaborators aimed a laser scanner system at Greenland’s Helheim Glacier. Their long-running survey reveals that Helheim’s massive calving events don’t behave the way scientists once thought, reframing how ice loss contributes to sea-level rise.

    Nov 4, 2025