Instead of using batteries the flashlight uses Peltier tiles. Peltier tiles produce electricity when one side of the tile is heated and the other is cooled. In her first attempts she was able to produce enough power, but not enough voltage. But eventually she was able to find a solution and produce a working flashlight.

 

Makosinki was able to build the flashlight for under 30 dollars. And considering you will never need to buy batteries, it’s a great deal.

 

She is currently one of 15 finalists in the Google Science Fair. The grand prize is $50,000 dollars and a trip to the Galapagos Islands. The final round will be held in Mountain View, California this September.