In a flash the foil was clean, and a clear mist hung in the air without any burning taking place.

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Its four carbon fiber and foil wings beat up to 20 times per-second, propelling it through the air as if it were swimming rather than flying.

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Plastic tops were removed, foil peeled off, paper containers unclasped, and the room filled with a happy clatter, the air with culturally diverse aromas: curry, ginger, garlic, basil.

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