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  • How a year in space affects the brain

    Penn Medicine’s Mathias Basner discusses the NASA Twins Study, which analyzed astronaut Scott Kelly’s physical and mental health after he spent 340 days in space, and found that Kelly’s performance on a cognitive test battery dropped when he returned to Earth for six months.
    Astronaut in a space suit on a spacewalk outside the International Space Station.
    Astronaut Scott Kelly on his nearly year-long mission on the International Space Station. (Photo: NASA)

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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