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"   1967 197119721982198619921993199920072008Rx for Thirst  The Slingshot, powered by a Stirling engine and meant for developing countries, uses vapor distillation to purify even the rankest water.   "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/a4658/4333142/>