The food is remarkable: pure, elemental, and as clean-tasting as the water sparkling outside.

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In absorption mode, the cloth can hold 340 percent of its own weight -- compared to just 18 percent without the polymer's aid -- and when it warms up, it releases the collected moisture as clean and pure potable water.

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Piping hot water is siphoned off to public pools, where the water is minimally treated to keep it as pure as possible.

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Slingshot is a vapor-compression water-purification machine that can produce about 30 liters of 100% pure distilled water per hour using the same power as a hair dryer consumes.

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