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  1. Life

    Tickling apes reveals laughter’s origins

    Roots of laughter go back at least 10 to 16 million years, study of romping apes suggests.

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  2. Physics

    Mechanical systems all tangled up

    Researchers link the motion of two ion pairs through “spooky action at a distance.”

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  3. Alpine Antarctica, before the ice

    A new survey may have unveiled the birthplace of the world’s largest ice sheet.

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  4. Health & Medicine

    Nicotine’s role in SIDS

    New study in rats explains how smoke exposure may increase risk of sudden infant death syndrome.

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  5. Life

    No rest for weary fruit flies

    Fruit flies with insomnia may help researchers track genetic factors that lead to the sleep disorder.