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  • Show Me the Bitcoins

    Though still volatile, Bitcoin is surging in value and being spent more freely; it’s also inspired a legion of competitors.

    9 comments

  • Mobile Makeover

    Smartphones have transformed computing astonishingly quickly. Case in point: a billion devices with Google’s Android software were activated in just five years. No other technology ever drew so many users so fast, according to analyst Horace Dediu of Asymco.

    8 comments

  • Small Gains

    Wind and solar power are ­ramping up quickly, but the world’s demand for electricity is growing much faster.

    6 comments

  • The Many Tongues of Twitter

    Twitter’s footprint is growing fast, although English speakers in the U.S. remain the largest demographic. The trick now is to turn its global presence into advertising dollars.

    4 comments

  • Space over Time

    Human exploration is the most visible use of spaceflight, but ­business and defense satellites fill the sky.

    4 comments

  • Water Power

    Decisions about future energy sources will need to factor in water consumption as well as greenhouse-gas emissions.

    4 comments

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