August 1, 2025

A workout can be a mental health boost—or a psychological strain. Two exercise researchers discuss what physical activity does to your mind. Plus, in a new book, mathematician Adam Kucharski traces our relationship to truth from the ancient Greeks to our AI reality. And, a researcher who studies the effects of extreme cold on the body throws a few drops of icy water on cold plunges.

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When ‘Proof’ Isn’t Enough

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