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There's a second alternative: A growing number of New Yorkers are going for duct-free AC systems that involve a small, wall-mounted indoor fan powered by a separate outdoor unit the size of suitcase.
WSJ: Ugliness for All
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Unlike the more familiar turbojet, which uses a turbine-powered fan to compress the incoming air before it is mixed with fuel, a ramjet compresses air by forcing it down an ever-narrowing funnel.
ECONOMIST: Jet propulsion
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Japanese Apple fan site Macotara is reporting Apple has ordered up a MacBook Air powered by the ARM-based A5 processor Apple designs.
FORBES: Did Apple Put iPad's Brain In MacBook Air's Body?