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  1. Health & Medicine

    A Fishy Therapy

    Shark cartilage continues to be sold to fight cancer, even though its efficacy has not been confirmed by any major U.S. trials.

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  2. Cytoplasm affects embryonic development

    The DNA in a fertilized egg's mitochondria may play a pivotal role in the organism's growth.

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  3. Health & Medicine

    Protein may aid stroke recovery

    Tests in mice have shown that erythropoietin, a red blood cell growth factor, can reverse brain damage caused by strokes.

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  4. Astronomy

    Hole power

    New computer simulations and observations are adding to the evidence that supermassive black holes control the growth of the galaxies they inhabit, wielding an influence far beyond their gravitational grasp.