15-year-old Ann Makosinski is among the finalists in the Google’s global science fair in her group age in which thousands of children from more than 100 countries took part. Her invention is a flashlight powered only by the heat of human hands.
The main idea is that the flashlight is supported by the thermoelectric effect caused by the electricity generated using the difference between temperatures. When you hold the flashlight the tile which is on the outside is heated by the warmth of your hands while the tile, fixed on the other side of the tube, stay cold because of the freely floating air. The difference between these two temperatures generates the electricity which powers the flashlight.
Makosinski built two flashlights: one made from aluminium tube and another made from PVC tube. She claimed that both types of flashlight worked properly at lower temperature. They emitted steady beam of light for at least 20 minutes and even longer when the temperature was about 5 degrees.
Google will announce the winners in all three age groups in September in the Californian campus of Google, where the 15 finalists will go. The big price is $50 000 scholarship and a trip to Galapagos Islands.