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  • AZ30

    Why

    New types of photovoltaics are reducing the cost of solar power.

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  • CA6

    Why

    The rest of the consumer electronics industry is scrambling to catch up to the iPad. The iPhone still sets the standard for smart phones, even if its market share slips.

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  • CA7

    Why

    Powerful computing devices are proliferating because of chips that incorporate every-smaller features without rising in price.

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  • CA9

    Why

    Many doctors and researchers lack the resources to sequence genomes and analyze them themselves.

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  • CA11

    Why

    It still sets the agenda in Web search, even as it pushes the development of Android for mobile devices.

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  • CA14

    Why

    Quick, cheap DNA sequencing will lead to new diagnostic test and targeted treatments.

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  • CA15

    Why

    Inexpensive video on demand, delivered over the Internet, undercuts cable and points the way to a likely future for TV.

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  • CA22

    Why

    It efficiently produces solar thermal power, which focuses sunlight to heat water into steam.

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  • CA29

    Why

    Social networking on the Web is becoming a powerful advertising medium and a platform for startups that offer add-on services.

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  • CA43

    Why

    Budget cuts will force NASA to rely on private companies for supply missions and other tasks.

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  • CA44

    Why

    Expanding the use of mobile payments will help small businesses.

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  • CA48

    Why

    Now that the company has begun to make money from its large user base, a service that has woven its way into everyday life is more likely to stick around.

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  • CA50

    Why

    Companies are building businesses inside platforms like Facebook.

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  • MA4

    Why

    Smart electrical grids and more efficient power cables can help save money and energy.

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  • MA47

    Why

    Conventional solar power is still too expensive to compete with fossil fuels, in part because of the cost of manufacturing silicon-based solar cells.

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  • NY33

    Why

    Computing can transform infrastructure such as electric grids and traffic control systems.

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  • WI24

    Why

    Screening drugs on human heart cells will help researchers find treatments for cardiac problems and test drugs for toxic side effects.

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  • World

  • 1

    Why

    Lithium-ion batteries make electric cars possible at mass-market prices.

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  • 2

    Why

    The exponential growth in traffic on the Web is possible because of services that route data intelligently.

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  • 3

    Why

    E-books are finally becoming a large, mainstream market.

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  • 5

    Why

    Advanced biofuels could help reduce the use of gasoline and diesel.

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  • 10

    Why

    Embryonic stem cells provide a potential source of replacement tissue for use in treating an array of degenerative diseases and injuries.

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  • 13

    Why

    Robots can save lives by doing jobs too dangerous for people.

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  • 16

    Why

    Mainstream use of electric cars could benefit the environment, especially where power is produced relatively cleanly.

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  • 18

    Why

    DNA sequencing provides a way to detect microbes in the environment and monitor the spread of viruses in our bodies.

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  • 21

    Why

    Targeting cancer drugs narrowly to tumor cells will improve efficacy and reduce the side effects of chemotherapy.

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  • 23

    Why

    Its technology can reduce the cost of computing in data centers.

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  • 25

    Why

    Simple, fast diagnostic tests can help physicians track disease-related markers.

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  • 26

    Why

    Web applications must get faster and feel much more responsive to users if cloud computing is to keep growing.

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  • 27

    Why

    Corporate decision-making gets smarter if it taps the insights of rank-and-file employees

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  • 28

    Why

    Reducing the cost of constructing solar thermal plants will make them more competitive with fossil-fuel plants.

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  • 32

    Why

    By encouraging millions of people to sign up for quirky daily advertising e-mails, Groupon has created one of the fastest-growing revenue generators on the Web.

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  • 34

    Why

    Biofuels could be far cheaper if they weren't made from corn, sugarcane, and other forms of biomass.

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  • 35

    Why

    Light-emitting diodes are an energy-efficient option for lighting in buildings and homes, but they are still expensive.

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  • 36

    Why

    Augmented reality enhances the value of a mobile device, employing its camera and GPS and displaying information about the user's surroundings.

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  • 37

    Why

    Computer chips that operate with probabilities instead of binary logic could speed applications such as fraud analysis and machine vision.

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  • 38

    Why

    Biodegradable plastics that aren't made from petroleum offer several environmental benefits.

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  • 39

    Why

    User interfaces based on gesture recognition make possible new applications in gaming and everyday computing.

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  • 40

    Why

    Retrofitting existing buildings is a cost-effective way to increase energy efficiency.

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  • 42

    Why

    Computer intelligence in the electric grid will make energy distribution more efficient.

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  • 46

    Why

    Genetically engineered microbes are a promising way to make biofuels.

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  • 49

    Why

    Web tools can help people respond to crises such as earthquakes and political protests.

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  • China31

    Why

    Increasing the time that turbines are operational will lower the cost of wind power.

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  • China45

    Why

    Extremely large-scale production of solar panels is reducing the technology's cost.

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  • Germany41

    Why

    Improving the electric grid is crucial to making alternative energy sources less expensive.

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  • Japan20

    Why

    Hybrid cars can significantly reduce gasoline consumption by using an electric motor alongside a gasoline engine.

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  • Switzerland17

    Why

    Understanding molecular pathways of rare diseases can shed light on common ones.

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  • Switzerland19

    Why

    Drugs that target genetic mutations unique to cancer cells may be more effective than ones that act more broadly.

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  • Taiwan12

    Why

    Smart phones that run Android have become an alternative to Apple's mobile devices.

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  • United Kingdom8

    Why

    It is redesigning smart phones and tablets so that they'll use much less power and need recharging less often.

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