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A comment on 15-year-old girl invents flashlight powered by the heat of your hand.

Re:15-year-old girl invents flashlight powered by the heat o... by juandopazo on Saturday June 29, 2013 @01:05PM (#5963017)
I guess this is a consequence of the development of the LED. LEDs being so efficient allows for very low power sources and a thermocouple seems to be enough to light them. Pretty cool!
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