Ann Makosinski is a 15-year-old with a flashlight obsession. She won a bronze award for a piezoelectric flashlight at the Canada-Wide Science Fair last year. This year, her battery-free Hollow Flashlight has taken her all the way to the top-15 finalists of the Google Science Fair.
Makosinski was inspired by the idea that the human body is like a walking 100-watt lightbulb with untapped thermal energy potential. She decided to build a flashlight powered only by the warmth of a hand.
The basis for the Hollow Flashlight is Peltier tiles, tiles that produce electricity when one side is heated and the other side cooled.… Read more