The problem is old and tantalizingly difficult; it has baffled man's best technology. But a solution would be as valuable as the elusive gold that beckoned to ancient alchemists. So scientists go right on searching for a practical system for converting sea water to fresh water. For all their efforts, though, water from conventional distillation plants is still too expensive to be used anywhere except at isolated military posts or desert oil centers. The freeze-separation process, which removes fresh water as ice crystals, may some day prove more economical, but the cheapest...
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