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  1. Tech

    Tiny ticker

    Researchers have demonstrated that they can control how frequently a DNA-based nanodevice changes between two forms.

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  2. Ecosystems

    Saving Sturgeon

    Sturgeon species around the world are in trouble, which is why humans will increasingly be stepping in to give them a big assist.

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  3. Eat Smart

    Your daily diet may have an impact on your brain's resiliency in the face of injury or disease.

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  4. Math

    The Galois Story

    Mystery still surrounds the tragic death of young mathematician Évariste Galois.

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  5. Humans

    From the February 22, 1936, issue

    Winter snows and densely packed matter.