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Hong Kong's Skyline Farms Harvest More Happiness than Food

High above downtown Hong Kong's bustling, traffic-clogged streets, a group of office workers was toiling away not on a corporate acquisition or a public share offering but on harvesting a bumper crop of lettuce atop one of the skyscrapers studding the city's skyline.  It's rooftop farming taken to the extreme, and more about reaping happiness than providing food.  The volunteers were picking butter lettuce, Indian lettuce and Chinese mustard leaf in rows of low...

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