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  1. The challenges of seeing the profusion of tiny life

    Editor in chief Nancy Shute marvels at the diversity of tiny life-forms known as protists.

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  2. Readers discuss lucid dreaming and sports supplements

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  3. Science & Society

    Curbing pedestrian stops might not reduce police-civilian encounters

    In Chicago, traffic stops soared as pedestrian stops fell. Single policy changes therefore don’t tell the whole policing story, researchers say.

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  4. Animals

    The right bacterial mix could help frogs take the heat

    Wood frog tadpoles that receive a transplant of green frog bacteria can swim in warm waters, revealing another role for microbiomes: heat tolerance.