Flashlight Powered By Body Heat [Video]
15-year-old Canadian student Ann Makosinski created a handheld light for the Google Science Fair.
Ann Makosinski is a 15-year-old from Victoria, British Columbia, who has created a flashlight that runs solely on the heat of the human hand. The Hollow Flashlight was a submission for the Google Science Fair and has secured her a spot as one of 15 finalists.
She designed a flashlight that provides bright light without batteries or moving parts. It uses four Peltier tiles, which produce electricity if one side is heated and the other is cooled. The design is ergonomic, thermodynamically efficient, and only needs a five degree temperature difference to work and produce up to 5.4 mW at 5 foot candles of brightness.