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  1. Health & Medicine

    Visual Clarity: People with MS maintain eyesight with drug

    A drug for multiple sclerosis seems to prevent subtle vision loss in many patients.

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  2. Tech

    A New Low: Lilliputian pipette releases tiniest drops

    Physicists have constructed a pipette that dispenses a billionth of a trillionth of a liter.

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  3. Planetary Science

    Northern Exposure: The inhospitable side of the galaxy?

    Our solar system's periodic motion from one side of the galaxy to the other could expose life on Earth to massive amounts of cosmic rays and cause recurring, catastrophic mass extinctions.

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  4. 19823

    Your article posits that every 64 million years a mass die-off occurs due to increased cosmic rays.