Here is the latest invention which won the £10 000 the prize at the 2011 James Dyson Awards. It is called the Airdrop.
Both work on the principle of drawing water from the air
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The principle of this latest low tech prototype invention is that "dry" air is sucked through the small wind turbine opening. It travels through an underground copper pipe filled with copper bearing balls (for more surface area) causing cooling of the air to take place. This cooling forms moisture which is captured. The small solar panel at the top of the unit powers a battery operated pump which delivers the water to the roots of plants.
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Clever. Very clever!