Through the tall windows of the control car, I watched the horizon slew as the ship struggled to keep steady.

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If New York has to do the same thing, there will be a problem: The tall windows on the Bryant Park side are much narrower.

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"All those tall buildings in Manhattan with glass exteriors and windows use soda ash, " says Nikhil Sen, GHCL's senior finance and strategy manager.

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The first, called Ease, is a mere foot in diameter by 16-inches tall and can fly safely in tight spaces or through open windows or doors, thanks to its petite size and ducted rotors.

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