Flashlight Powered By Body Heat

The Hollow Flashlight by 15-year-old Ann Makosinski is such an awesome and useful gadget, I’m surprised that no one else thought of it earlier. You know how, when there’s an emergency, there’s often a shortage of flashlights or batteries? Hand-cranked flashlights can be useful in such situations, since they’ll need manpower to run.

Turning that crank to power up the flashlight can get tiring after a while though. This is where Ann’s Hollow Flashlight comes in. It wasn’t named that way for nothing, since its handle really is hollow. The base of the flashlight is composed of Peltier tiles, which produce electricity when one side is heated while the other is cooled. In this case, the heat source is its user’s hand, while the cool side is the air in the hollow handle.

Ann writes: “I made two flashlights that do not use any batteries, toxic chemicals, or kinetic energy. They do not create any noise or vibrations and will always work. The flashlight’s only limitation is its need for at least a 5°C temperature difference to provide usable light.”

Ann worked with this concept and created the Hollow Flashlight after two prototypes. The flashlight won her the bronze award at the Canada-Wide Science Fair last year and it’s earned her a place in the top 15 of Google’s Science Fair this year.


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One thing Hazel loves more than geeky stuff is writing about their awesomeness. She graduated with a degree in Chemical Engineering but has always wanted to be a writer. As luck and a whole lot of work would have it, Hazel got her cake and is eating it, too: sifting through endless paperwork during the day while blogging for various tech and gadgetry blogs during the night. She also established her own gadgetry blog recently, which you can check out at Gigadgetry.com.