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  Aviation & Space

  Gallery: PiperJet

  The best small jet yet
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  Aviation & Space

  Gallery: Pratt and Whitney Pure Power Geared Turbofan Engine

  Fuel-sipping jet
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  Security

  Gallery: SCRATCHbot

  Ratlike whiskers give robots night vision
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  Recreation

  Gallery: Sea-Doo GTX Limited iS 255

  A personal watercraft puts on the brakes
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  Engineering

  Gallery: Shard Tower

  New method puts towers up faster
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  Auto Tech

  Gallery: The 2011 Nissan Leaf

  Nissan unveiled the Leaf this year. When it goes on sale next year, it'll be the first mass-market pure electric car
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  Auto Tech

  Gallery: Toyota Prius

  The best mileage in America
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  Health

  Gallery: Xhale HyGreen

  Keeping track of clean hands
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  Recreation

  Gallery: Yamaha FX Nytro MTX SE 162

  The nimblest snowmobile