Ann Makosinski – a 15-year old Canadian student – invented a torch powered by the heat from ones hands. The voltage is generated as a result of different temperatures on each side of the device. This phenomena is known as Peltier effect. The torch is hollow inside, which makes the inside cooler than the outside. This temperature difference, supported by heat from palms, creates energy to power the torch.
The torch is able to maintain the light for 20 minutes, which makes it useful in emergency situations. Ann is one of the 15 finalists presenting her project at the Google Science Fair in Mountain View, California in September.