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  1. Computing

    Going viral takes a posse, not an army

    Quality of followers, not quantity, determines which tweets will fly

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  2. Earth

    Most BP oil still pollutes the Gulf, scientists conclude

    Below the surface, plumes of oil are proving slow to disperse and break down.

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  3. Space

    Moon shrinks

    New pictures expand evidence of the moon’s shrinkage over the past billion years.

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  4. Plants

    Chlorophyll gets an ‘f’

    New variety of photosynthetic pigment is the first to be discovered in 60 years

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  5. Planetary Science

    Worldwide slowdown in plant carbon uptake

    A decade of droughts has stifled the increasing growth of terrestrial vegetation.