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  1. Like a Bolt from Above

    Lightning scientists begin to solve electric mysteries.

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  2. Health & Medicine

    Measles cases up in U.S. and Canada

    Both countries report 2011 to be the worst year since the mid-1990s.

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  3. Life

    Cycads not ‘living fossils’

    Though ancient, today’s representatives of the plant group date back to a common ancestor that lived not all that long ago.

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  4. Life

    Live long, pass it on

    A tendency for a lengthy life can be inherited for several generations, even when offspring no longer have the genes for it.

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  5. Psychology

    Learning to walk on err

    Flub-inducing treadmill tasks aid motor learning, with rehab implications.