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Like a magnifying lens, only with rocks.
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Wear it one way and, under power, keep your cool. Flip it around and you can power your Walkman while you jog.
Also useful for sleeping bags, and blankets that allow emergency personnel to keep a shock victim's body temperature stable.
Ars Technica: Peltier Cooling
Named after French watchmaker and physicist Jean Charles Athanase Peltier, discoverer of the Peltier effect (1834). [jutta, Jan 12 2002]