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  1. Physics

    Nanobots walk ‘n’ roll

    A molecule that waddles on stubby feet and another that drives on ball-like wheels demonstrate scientists' increasing control over the usually haphazard motion of molecules on surfaces.

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  2. Paleontology

    Some plesiosaurs went for clams

    The fossils of plesiosaurs recently unearthed in Australia suggest that the long-necked, aquatic reptiles had a more varied diet than scientists had previously suspected.

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  3. Materials Science

    Brainy bandages

    Researchers have taken a step toward smart bandages that would indicate the presence of an infection in a wound.

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  4. 19606

    In the article, cleanup of radioactive particles that have seeped into porous building materials such as brick and marble appears to be difficult and expensive, even given the described breakthroughs.