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  • Beyond topological insulators

    Charlie Kane and Eugene Mele’s groundbreaking theories on the existence of a new class of materials continues to inspire an upcoming generation of physics researchers.
    eugene mele and charlie kane
    This year, Charles Kane (right) and Gene Mele mark 30 years of working together in Penn’s Department of Physics & Astronomy. Their groundbreaking theories on the existence of a new class of materials continues to inspire an upcoming generation of physics researchers, including theorists and experimentalists here at Penn who are delving deeper into these groundbreaking theories and working towards new applications. (Pre-pandemic image)

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  • OpenAI, DeepSeek, and Google vary widely in identifying hate speech
    Two people work on coding at computer.

    Image: Kindamorphic via Getty Images

    OpenAI, DeepSeek, and Google vary widely in identifying hate speech

    Neil Fasching and Yphtach Lelkes of the Annenberg School for Communication have found dramatic differences in how large language models classify hate speech, with especially large variations for language about certain demographic groups, raising concerns about bias and disproportionate harm.

    Sep 10, 2025