Teenager’s bright idea: flashlight fueled by body heat.

The Gajitz blog has the scoop on the kid who invented a battery-free flashlight that runs on body heat:

Ann Makosinski, a 15 year old student from Canada, made a flashlight for her science fair project – a flashlight powered entirely by the body heat of the hand holding it. To be fair to the rest of us, though, this wasn’t any old science fair; this was the Google Science Fair, a global competition that brings out the best and brightest in the 13 to 18 age range.

Makosinski used Peltier tiles to create the flashlight. These tiles produce electricity when they are heated on one side and cooled on the other. A temperature difference of just five degrees is enough to power the LED bulb on the Hollow Flashlight.

The average amount of electricity generated by palm heat was about 57 milliwatts in tests, and only about half a milliwatt is required to light the LED.

Why didn’t *I* think of that?

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