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Synopsis: In this episode of "Water - The Drop of Life", we focus on the never-ending search for water. From the hunter bushmen in the Kalahari Desert to the inhabitants of Mexico City, this installment examines water scarcity problems. In Chile, nets capture fog. In Petra, Jordan, we see ancient water systems. In Australia, a cattle breeder gains knowledge from the Aborigines. In Yemen, groundwater tables are sinking and this country might be the first to run dry. Cities like Los Angeles are facing some of the same challenges as Yemen. In Egypt an effort is under way to transform the desert into a fruitful oasis using a new technology called DriWater. At the Johnson Space Flight Center in Texas, new technologies may one day help preserve water both in space and on Earth. Reverse osmosis is one promising method of reducing the cost of desalination. Farmers along the coasts of Europe and North America may one day farm native sea vegetables.