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  1. Health & Medicine

    Window of opportunity for stroke treatment widens

    Use of clot-busting drugs as long as 4½ hours after an event pays dividends later.

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  2. Physics

    Photons caught in the act

    Physicists manipulated a microwave pulse and could essentially watch it transition from a quantum state into the realm of classical physics.

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  3. Health & Medicine

    Closing in on Rett syndrome

    Scientists find that a particular part of the mouse brain is responsible for behavioral abnormalities associated with Rett syndrome, an autism spectrum disease that strikes females.

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  4. Health & Medicine

    Diabetes drug helps shed pounds

    The diabetes drug pramlintide facilitates year-long weight loss in obese volunteers, a new study shows.