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  1. Flawed Stem Cells Yield Fragile X Clues: Researchers study genetic disorder via discarded embryos

    The most common inherited cause of mental retardation arises when a mutated gene is shut down early in embryonic development.

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  2. Health & Medicine

    Bone Builder: Drug may offer steroid users new protection against fractures

    A bone-growth medication called teriparatide outperforms the standard bone-preserving drug alendronate in people with steroid-induced osteoporosis.

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  3. Astronomy

    Flare-Up: Comet Holmes’ surprise bloom

    Comet 17P/Holmes abruptly brightened last month, blossoming into a naked eye object.

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  4. Crime Growth: Early mental ills fuel young-adult offending

    Mental disorders in children can lead to criminal behavior in adulthood.