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  1. Astronomy

    Starry eruption on a grand scale

    Monitoring the bloated star Rho Cassiopeiae, astronomers report they witnessed an explosion that blasted more material into space than any other stellar explosion ever observed.

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  2. Physics

    Streams plus nanostrands equals electricity

    A dense bundle of carbon nanotubes develops a voltage difference along its length when immersed in a slow-flowing liquid.

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  3. 19221

    Your article reports that chemically synthesized erythropoiesis protein (SEP) was more effective than the genetically engineered molecule. Is there speculation on why that is? Ann DershowitzWest Orange, N.J. Chemically constructed SEP molecules are much more consistent in size, shape, and other properties than genetically engineered erythropoietin.